The name of four Holy Roman Emperors, a Frankish king, and a number of saints, as well as the baptismal name of a 14th C pope.
 
  
  
  The forms Otto and Otho are preferred in Germany, with Odo being more common in France.  In Ireland, Odo was sometimes used as an anglicization of Aodh.
  
  
- Austria
- 
- Latin
- ● 942 Otto (nom) UrkStyria 22,
 Ottonis (gen) ibid. 22;
 979 Otto (nom) ibid. 28;
 c1065 Ottonis (gen) ibid. 67;
 c1066 Otto (nom) ibid. 68;
 c1070 Otto (nom) ibid. 74;
 c1100 Otto (nom) ibid. 89,
 Ottonis (gen) ibid. 89;
 1103 Otto (nom) ibid. 94a;
 c1128 Otto (nom) ibid. 120,
 Ottonis (gen) ibid. 118a;
 1231 Otto (nom) UBEnns3 I,
 Ottone (abl) ibid. II;
 1237 Otto (nom) hennes-vol1 96;
 1268 Otto (nom) ibid. 197;
 1277 Ottone (abl) FRA-XXXL 355
 
- Belgium
- 
- Latin
- ● 1107 Odo (nom) CartStBert 3,
 Odone (abl) ibid. 3,
 Odonis (gen) ibid. 3;
 1238 Otto (nom) OvdFB 3
- Dutch
- ● 1597x1598 Otto BoonenGes p. 378
 
- Brabant
- 
- Latin
- ● 1312 Ottho (nom) JeanIII p. 25,
 Otto (nom) ibid. p. 28
 
- Czech Republic
- 
- Latin
- ● 1349 Ottoni (dat) chlumecky 36;
 1353 Ottoni (dat) ibid. 97;
 1356 Otto (nom) ibid. 130
- ◑ 1351 Otycone (abl) chlumecky 52,
 Otyk (nom) ibid. 35;
 1358 Ottiko (nom) ibid. 394, p. 36;
 1377 Odolenus (nom) LDFPUP1 p. 32
- Middle High German
- ● 1331 Ott (nom) Rössler1 36;
 c1339 Otto (nom) ibid. 93;
 1342 Ott (nom) ibid. 98;
 1349 Otten (gen) ibid. 48;
 1389 Otto (nom) ibid. 118
 
- Denmark
- 
- Latin
- ● 1362 Otto (nom) MIRGPCM4 XVI-V
- Danish
- ● 1581 Otthe KD-1 no. 362
 
- England
- 
- Latin
- ● 1185x1186 Oto (nom) PR-XXXVI p. 11;
 1189 Odo (nom) GASurv p. 151,
 Odonis (gen) ibid. p. 145;
 1222 Odo (nom) StPaulDom p. 22,
 Odonis (gen) ibid. p. 23;
 1246 Odonem (acc) PSS-II p. 6,
 Odonis (gen) ibid. p. 6;
 1296 Odo (nom) RCS-1 p. 93b,
 Odonis (gen) ibid. p. 95a;
 1337 Ottoni (dat) MHCG2 459
 
- Estonia
- 
- Middle Low German
- ● 1431 Otte BbRT p. 355
- ◑ 1385 Otke BbRT p. 338;
 1386 Otke ibid. p. 338;
 1406 Otke ibid. p. 344;
 1433 Otke ibid. p. 356;
 1434 Otke ibid. p. 357;
 1436 Otke ibid. p. 358;
 1592 Ottste Tiik1977 p. 287
 
- Finland
- 
- Early Modern Swedish
- ● 1548 Ottes (gen) Audén1980 p. 169
 
- France
- 
- Latin
- ● 2h12thC Odo (nom) NotSLdN III;
 699 Otto (nom) DCEL-2 Add. X;
 700 Ocdo (nom) ibid. XIV;
 c823 Odo (nom) irminon-vol2 94, Ved;
 937x93 Odon (acc) St-Barnard-Romans no. 99,
 Odoni (gen) ibid. no. 80;
 980 Odo (nom) NotSLdN p. 247;
 1007x1008 Odonis (gen) DocMonSav p. 96;
 1032x1100 Odoni (dat) LDS LXV,
 Odonis (gen) ibid. LXV;
 1051 Oddo (nom) St-Barnard-Romans no. 142;
 1067 Odo (nom) CartNDSaintes XII,
 Odonis (gen) ibid. XII;
 1079x1081 Odo (nom) ibid. XXI,
 Oto (nom) ibid. XXI;
 1079x1101 Odo (nom) CartStPC IX;
 1082x1087 Odo (nom) St-Barnard-Romans no. 120;
 1090 Odonis (gen) CartSPL1 VII;
 1101x1129 Odo (nom) CartStPC XXII,
 Odone (abl) ibid. XXVIII;
 a1108 Odo (nom) ibid. XXI;
 a1116 Odo (nom) ibid. XX,
 Odonis (gen) ibid. XX;
 c1120 Odo (nom) CartNoyers CDXXXVI;
 1123 Odonis (gen) CartNDJosaphat XII;
 1125x1136 Odonis (gen) CartYonne1 CXXXIX;
 1130 Udone (abl) CartStPC VIII;
 1130x1150 Udo (nom) ibid. XXVII;
 1135 Odo (nom) clairvaux-12thc 7,
 Odone (abl) ibid. 7,
 Oto (nom) ibid. 7;
 1138x62 Odo (nom) ibid. 66,
 Odonis (gen) ibid. 66;
 c1140 Odo (nom) CartNDdOurscamp LXXXIII;
 1143x1146 Odo (nom) clairvaux-12thc 12;
 1146 Odo (nom) CartNDSaintes VIII;
 1147 Hoto (nom) clairvaux-12thc 15,
 Odo (nom) ibid. 14,
 Odone (abl) ibid. 14;
 c1147 Odonis (gen) CartNDdOurscamp LXII;
 1147 Odonis (gen) clairvaux-12thc 17;
 1147x1162 Odo (nom) ibid. 44;
 1151 Odo (nom) ibid. 23;
 1153 Odo (nom) CartNDSaintes IX;
 1154 Odo (nom) CartNDdOurscamp LIV,
 clairvaux-12thc 27;
 c1156 Odonis (gen) CartNDdOurscamp XXXII;
 1159 Odo (nom) StVdM-II 736;
 1160 Odonis (gen) CartNDdOurscamp CXIV;
 c1160 Odonis (gen) ibid. XVI;
 1162 Odonis (gen) clairvaux-12thc 39;
 1163 Oddo (nom) ibid. 94,
 Odo (nom) ibid. 99,
 Odonis (gen) ibid. 99;
 1163–64 Odo (nom) ibid. 106,
 Odonis (gen) ibid. 106;
 1164 Odo (nom) ibid. 120,
 Odonis (gen) ibid. 120;
 1165 Odo (nom) ibid. 125;
 1166 Odo (nom) ibid. 130,
 Odone (abl) ibid. 130;
 1171 Odo (nom) ibid. 140;
 1173 Odo (nom) ibid. 154;
 1174 Odo (nom) CartNDdOurscamp CXX,
 clairvaux-12thc 161,
 Odone (abl) CartNDdOurscamp CXX,
 Odonis (gen) ibid. CXX;
 c1175–1180 Odo (nom) ChartCaen2 p. 69,
 Odonis (gen) ibid. p. 61;
 1178 Odo (nom) clairvaux-12thc 166,
 Odone (abl) ibid. 166,
 Odonis (gen) NotSLdN I,
 clairvaux-12thc 166;
 1179 Odo (nom) ibid. 172,
 Odone (abl) ibid. 176,
 Odonis (gen) ibid. 172;
 1180 Odone (abl) CartNDdOurscamp LV,
 RotScaNor p. 3,
 Odonis (gen) ibid. p. 14,
 Otonis (gen) ibid. p. 1;
 1183 Odone (abl) CartNDdOurscamp LVI;
 1187 Odonis (gen) ibid. LVII;
 1190 Odo (nom) ibid. CIII;
 1194 Odone (abl) ibid. CLVI;
 1196 Odo (nom) ibid. CXXXIX;
 c1200 Odo (nom) CartSavII 201;
 1201 Odo (nom) CartNDdOurscamp LXI,
 NDParisII 1-IX,
 Odonis (gen) ibid. 2-XLVIII;
 1203 Odo (nom) ibid. 2-LXXIX;
 1204 Odo (nom) ibid. 2-LXXXVI;
 1206 Odo (nom) CartNDdOurscamp XIV,
 NDParisII 2-LXIX;
 1209 Odonis (gen) CartNDdOurscamp LII;
 1214 Odonis (gen) ibid. CXLI;
 a1215 Odonis (gen) NDParisII 2-LXXIII;
 1217 Odo (nom) CartNDdOurscamp XXXI,
 Odonis (gen) ibid. XXXI;
 1227 Odone (abl) ibid. XLV;
 1236 Odo (nom) NDParisII 2-XXXIX;
 1238 Odonis (gen) CartNDdOurscamp CXXX;
 1255 Odo (nom) ArrestReg-volI IX, Candlemas;
 1257 Odone (abl) ibid. XV, BMV;
 1258 Odo (nom) ibid. XXIX, Candlemas;
 1259 Odonem (acc) ibid. II, BMV,
 Odonis (gen) ibid. XIII, St. Martin;
 1260 Odo (nom) ibid. VI, Candlemas;
 1267 Odo (nom) NDParisII 2-XXVII;
 1273 Odo (nom) ibid. 2-XLIII;
 1283–86 Otho (nom) GasReg-A;
 1287 Otho (nom) ibid.;
 1301 Odonis (gen) MemPic-vol17 p. 258;
 1310/11 Otho (nom) GasReg-A;
 1310 Otho (nom) ibid.;
 1313 Odonem (acc) CartNDdOurscamp LXXXVIII;
 1345 Ottoni (dat) CDEM-7.2 626;
 1378 Odo (nom) hanquetvol1 581
- ◑ 1147 Odelini (gen) clairvaux-12thc 14;
 1179 Odinus (nom) ibid. 176;
 1260 Odinus (nom) ArrestReg-volI XII, Candlemas
- Old French
- ● 1296 Eude paris1296 p. 27,
 Heude ibid. p. 14;
 1313 Eude Paris1313 p. 18,
 Heude ibid. p. 24,
 Œude ibid. p. 15
- ◑ 1133 Eudon (obl) tailliar no. 1;
 1292 Otelin 1292paris p. 2;
 1313 Houdet Paris1313 p. 3,
 Othelin ibid. p. 87,
 Oudin ibid. p. 6
- Middle French
- ◑ 1392 Houdet MemBret-II col. 601;
 1418 Odin HGParis p. 376,
 Oudin ibid. p. 380
 
- Germany
- 
- Latin
- ● 726 Odonis (gen) OrkGZ no. 7;
 822x875 Hodo (nom) TradCorb §4,
 Oddo (abl) ibid. §123,
 Oddone (abl) ibid. §97;
 937 Otto (nom) HambUrk-vol1 XXXI,
 Ottoni (dat) ibid. XXXII,
 Ottonis (gen) ibid. XXXI;
 941 Otto (nom) quix-vol1 11,
 Ottonis (gen) ibid. 11;
 947 Otto (nom) ibid. 12,
 Ottonis (gen) ibid. 12;
 948 Ottho (nom) ibid. 88,
 Otthone (abl) ibid. 88,
 Otthonis (gen) ibid. 88;
 954 Otto (nom) UrkStyria 23,
 Ottone (abl) ibid. 23,
 Ottonis (gen) ibid. 23;
 961 Otto (nom) ibid. 24,
 Ottone (abl) ibid. 24,
 Ottonis (gen) ibid. 24;
 965 Otto (nom) HambUrk-vol1 XLI,
 Ottonis (gen) ibid. XLI;
 966 Otto (nom) ibid. XLIII,
 quix-vol1 13,
 Ottonis (gen) HambUrk-vol1 XLIII,
 quix-vol1 13;
 967 Otto (nom) HambUrk-vol1 XLIV,
 Ottonis (gen) ibid. XLIV;
 972 Otto (nom) quix-vol1 15,
 Ottonis (gen) ibid. 15;
 974 Ottho (nom) ibid. 89,
 Otthonis (gen) ibid. 89,
 Otto (nom) HambUrk-vol1 XLV,
 Ottonis (gen) ibid. XLV;
 977 Ottonis (gen) UrkStyria 27;
 980 Otto (nom) ibid. 29,
 Ottonis (gen) ibid. 29;
 983 Otto (nom) HambUrk-vol1 XLVI,
 Ottonis (gen) ibid. XLVI;
 985 Ottho (nom) quix-vol1 90,
 Otthonis (gen) ibid. 90,
 Otto (nom) UrkStyria 32,
 Ottonis (gen) ibid. 32;
 988 Otto (nom) HambUrk-vol1 XLIX,
 Ottonem (acc) ibid. LI,
 Ottonis (gen) ibid. XLIX;
 997 Ottho (nom) quix-vol1 91,
 Otthoni (dat) ibid. 49,
 Otthonis (gen) ibid. 91,
 Otto (nom) ibid. 16,
 Ottonis (gen) ibid. 16;
 998 Otto (nom) ibid. 17,
 Ottonis (gen) ibid. 17;
 1000 Otto (nom) UrkStyria 33,
 quix-vol1 19,
 Ottonis (gen) UrkStyria 33,
 quix-vol1 19;
 1001 Otto (nom) HambUrk-vol1 LIV,
 Ottonis (gen) ibid. LIV;
 1003 Ottonis (gen) ibid. LVI;
 1009 Oddo (nom) ibid. LVIII,
 Oddonem (acc) ibid. LVIII;
 1061 Vdo (nom) quix-vol1 60,
 Vdone (abl) ibid. 60;
 1064 Vdo (nom) ibid. 92;
 1112 Ottonis (gen) ibid. 26;
 1114 Ottonis (gen) UrkStyria 99;
 1134 Otto (nom) quix-vol1 97;
 1136 Otto (nom) ibid. 98,
 Udo (nom) ibid. 98;
 1138 Vdo (nom) ibid. 28;
 1142 Ottonis (gen) mairhofer VII;
 1147 Ottonis (gen) quix-vol1 29;
 1151 Otto (nom) mairhofer XXXVI;
 1165 Ottonis (gen) quix-vol1 31;
 1194 Otto (nom) ibid. 54;
 1207 Otto (nom) hennes-vol1 8;
 1210 Otto (abl) ibid. 10,
 Ottone (abl) CDL-1.1.1 IV;
 1211 Ottone (abl) hennes-vol1 11;
 1212 Otto (nom) ibid. 12,
 Ottone (abl) quix-vol1 103;
 1213 Otto (nom) hennes-vol1 14;
 1214 Otto (nom) ibid. 15;
 1215 Otto (nom) quix-vol2 126;
 1216 Oddo (nom) hennes-vol1 20,
 Otto (nom) ibid. 24;
 1217 Otto (nom) ibid. 28;
 1219 Otto (nom) ibid. 39,
 Vdonis (gen) quix-vol1 73;
 1220 Otto (nom) hennes-vol1 44,
 Ottonis (gen) quix-vol2 129;
 1221 Otto (nom) ibid. 130;
 1222 Otto (nom) quix-vol1 74,
 quix-vol2 132;
 1225 Otto (nom) UrkMeck1 no. IX;
 1228 Otto (nom) ibid. no. XIV;
 1229 Otto (nom) ibid. no. XVI;
 1231 Otto (nom) CDL-1.1.1 XI;
 1234 Otto (nom) hennes-vol1 89;
 1240 Otto (nom) ibid. 104;
 1242 Otto (nom) UrkMeck1 no. XXXI;
 1249 Otto (nom) hennes-vol1 134;
 1250 Otto (nom) ibid. 138,
 Ottonis (gen) ibid. 138;
 1251 Otto (nom) ibid. 142;
 1252 Otto (nom) UrkMeck1 no. XLV;
 1253 Otto (nom) hennes-vol1 145;
 1256 Otto (nom) UrkMeck1 no. XLVIII;
 1260 Otto (nom) hennes-vol1 187;
 1261 Ottone (abl) FRA-XXXL 207;
 1275 Ottonem (acc) hennes-vol1 241;
 1276 Ottone (abl) ibid. 249,
 Ottonem (acc) ibid. 249,
 Ottonis (gen) ibid. 249;
 c1280 Otto (nom) UrkMeck1 no. LXXIV;
 1282 Otto (nom) ibid. no. LXXV;
 1284 Otto (nom) hennes-vol1 294;
 1286 Otto (nom) ibid. 302;
 1292 Otto (nom) UrkMeck1 no. LXXXIX;
 1301 Otto (nom) BremUrk2 no. 3,
 UrkHan 3,
 Ottonem (acc) BremUrk2 no. 1;
 1302 Otto (nom) ibid. no. 14,
 Ottone (abl) ibid. no. 22;
 1303 Otonem (acc) ibid. no. 35,
 Otto (nom) ibid. no. 29,
 Ottone (acc) ibid. no. 25,
 Ottoni (dat) ibid. no. 29,
 Ottonis (gen) ibid. no. 25;
 1305 Otto (nom) CDL-1.2.1 CXCIII;
 1309 Otto (nom) VFBStralsund 14;
 1338 Otto (nom) UrkHeil1 146;
 1351 Otto (nom) UrkHan 8;
 1394 Ottonis (gen) SMM p. 178;
 1401 Ottoni (dat) HD1401 no. 7,
 ottonis (gen) ibid. no. 128
- ◑ 1304 Odeke (nom) BremUrk2 no. 37
- Middle High German
- ● 1293 Ot (nom) UrkWitt-II 189,
 Ott ibid. 187,
 Otte (nom) ibid. 188,
 Otten (acc) ibid. 187
- Early New High German
- ● 1401 Ott (nom) UrkKH-2 907;
 1429 Ottens (gen) mairhofer DCCXXXII;
 1497 Ott Nurn1497 338
- Middle Low German
- ● 1304 Otto (nom) BremUrk2 no. 38;
 1332 Otte UrkHan 5;
 1347 Otten (acc) ibid. 7;
 1453 Otte VFBStralsund 678
 
- Ireland
- 
- Latin
- ● fin12thC Odo (nom) MunDocIr III, p. 22;
 1457 Odo (nom) RegOct 84,
 Odonem (acc) ibid. 84;
 1460 Odo (nom) ibid. 25,
 Odone (abl) ibid. 28,
 Odonem (acc) ibid. 25,
 Odonis (gen) ibid. 25;
 1496 Odo (nom) ibid. 35,
 Odonem (acc) ibid. 35,
 Odoni (dat) ibid. 35
 
- Italy
- 
- Latin
- ● 967 Otto (nom) RCI-Cam1 3;
 970 Otto (nom) UrkStyria 25,
 Ottonis (gen) ibid. 25;
 984 Ottonis (gen) ibid. 31;
 999 Otho (nom) HGSav-4.1 p. 1,
 Ottonis (gen) ibid. p. 2;
 1096 Otto (nom) UrkStyria 88;
 1138 Otto (nom) HAP p. 331;
 1142 Otto (nom) ibid. p. 333;
 1164 Otonis (gen) Livi p. 41;
 1224 Otto (nom) hennes-vol1 65;
 1229 Otto (nom) CDT1 XI;
 1236 Otone (abl) TirNot1 8,
 Ottonem (acc) ibid. 7,
 Ottoni (dat) ibid. 15,
 Ottonis (gen) ibid. 7;
 1237 Otto (nom) ibid. 585,
 Ottonis (gen) ibid. 587;
 1245 Otto (nom) hennes-vol1 120;
 1257 Otto (nom) OHZI-II no. 31,
 hennes-vol1 165;
 1261 Otto (nom) FRA-XXXL 209;
 1304 Octo (nom) ActDipVeneto-I-1 p. 55;
 1367 Ottonis (gen) SMM p. 129
- ◑ 1236 Ottolini (gen) TirNot1 11,
 Ottolinum (acc) ibid. 6;
 1265x1339 Utulini (gen) BBC-Berg 134;
 1285 Octonelli (gen) Perugia1285 p. 158,
 Oddoli (gen) ibid. p. 161;
 1310 Ottolinus (nom) MonRav-2 CCCL;
 1326 Ottolino (abl) Friuli-14thC no. 422,
 Ottolinus (nom) ibid. no. 422,
 Utulini (abl) ibid. no. 438
 
- Latvia
- 
- Latin
- ● 1288 Otto (nom) RigSB 528,
 Ottoni (dat) ibid. 388;
 1289 Otto (nom) ibid. 135,
 Ottoni (dat) ibid. 339;
 1290 Otto (nom) ibid. 137;
 1291 Otthoni (dat) ibid. 622,
 Ottone (abl) ibid. 650;
 1293 Otto (nom) ibid. 163;
 1294 Otthoni (dat) ibid. 170,
 Ottoni (dat) ibid. 735;
 1296 Ottoni (dat) ibid. 68;
 1299 Ottonis (gen) ibid. 277
- Middle Low German
- ● 1462 Otte Arbusow p. 99
 
- The Netherlands
- 
- Latin
- ● 834 Uddo (nom) OrkGZ no. 30;
 1235 Otto (nom) hennes-vol1 93;
 1243 Otto (nom) ibid. 112;
 1257 Othonem (acc) OHZI-II no. 28,
 Ottho (nom) ibid. no. 28;
 1270 Otto (nom) hennes-vol1 213;
 1288 Odo (nom) GesOIJ-1 p. 296,
 Odomis (gen) ibid. p. 296;
 1291 Otto (nom) ibid. p. 297,
 Ottonis (gen) ibid. p. 297;
 1311 Odo (nom) ibid. p. 298,
 Odonis (gen) ibid. p. 298;
 1347 otto (nom) ibid. p. 300;
 1349 Odonis (gen) ibid. p. 300
- Middle Dutch
- ● 1382 Ottens (gen) GesOIJ-4 p. 186
 
- Poland
- 
- Latin
- ● 1232 Otto (nom) UrkMeck1 no. XVII;
 1268 Otthone (abl) CDT1 XX;
 1288 Otto (nom) UrkMeck1 no. LXXXIV
- Middle High German
- ● 1324x1332 Otto SBGlatzer p. 1
 
- Scotland
- 
- Latin
- ● 1214–1226 Odonis (gen) morton-vol1 1
- ◑ 1427 Odenello (abl) RMSRS-2 105
 
- Spain
- 
- Latin
- ● 889 Oddone (nom) CDCB-XV MMXVII;
 1016 Odo (nom) ibid. MMCLXXIII;
 1192 Otonis (gen) ibid. MMCCVIII
 
- Sweden
- 
- Old Swedish
- ● 1383 Vd (gen) SRA-vol2 no. 1919;
 1419 Od (gen) SDHK no. 19242
 
- Switzerland
- 
- Latin
- ● 1155 Otho (nom) CartHaut 6;
 1157 Otto (nom) ibid. 7;
 1166 Octone (abl) ibid. 19,
 Otho (nom) ibid. 20;
 1179 Hoto (nom) ibid. 24;
 1180 Octo (nom) ibid. 26;
 1186 Otho (nom) ibid. 27;
 1215 Otho (nom) ibid. 34;
 1220 Oto (nom) ibid. 37;
 1235 Otto (nom) CLC p. 46,
 Ottone (abl) ibid. p. 39;
 1349 Othone (abl) MHN DXXIII;
 1350 Othone (abl) ibid. DXXIX;
 1351 Othone (abl) ibid. DXL;
 1417 Otthonem (acc) MHCG2 472;
 1456/7 Otthonem (acc) ibid. 226;
 1494 Oddo (nom) ibid. 259;
 1533 Ottho (nom) ibid. 303,
 Otthoz (nom) ibid. 303II
- ◑ 1348 Othonino (abl) MHN DXIV;
 1393/4 Ottheti (gen) MHCG2 467;
 1398 Octeti (gen) ibid. 469
- Old French
- ● 1348 Othe (obl) MHN DXII,
 Othes (nom) ibid. DXII
- Middle French
- ● 1350 Othe MHN DXXX,
 Othon ibid. DXXX;
 1353 Othe ibid. DL,
 Othes ibid. DL;
 1354 Othe ibid. DLIII
- ◑ 1354 Othenin MHN DLV
 
Cite as: R. Le Get, S.L. Uckelman. "Otto". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Otto.