The German vernacular form Adilhart is witnessed c1100 in the place name Adilhartsdorf (UrkStyr 89).

Austria

Latin

● 928 Adalhart (nom) UrkStyria 18; 930 Adalhart (nom) ibid. 19; c1070 Adalhart (nom) ibid. 74; c1100 Adilhardum (acc) ibid. 89; c1115 Adelhart (nom) ibid. 102; c1128 Adalhardi (gen) ibid. 118a

Belgium

Latin

● 1107 Alardus (nom) CartStBert 3; 1176 Alardus (nom) ibid. 22

Dutch

● 1597x1598 Alaert BoonenGes p. 322

Brabant

Latin

● 1312 Alardus (nom) JeanIII p. 2, Allardus (nom) ibid. p. 15

England

Latin

● 745 Æthelheardi (gen) CSM p. 1; 796 Æthelhardo (abl) ibid. p. 2, Æthelheard (nom) ibid. p. 2; 1222 Alardum (acc) StPaulDom p. 30

Early Modern English

● 1529 Alart PP-HenV p. 9; 1530 Alart ibid. p. 16

Walloon

● 1582 Allard RWC p. 4; 1582/3 Allard ibid. p. 563; 1583 Allard ibid. p. 6; 1584 Allard ibid. p. 8; 1590 Alard ibid. p. 14; 1591/2 Alard ibid. p. 19; 1591 Allart ibid. p. 19; 1591/2 Allart ibid. p. 20; 1592 Alard ibid. p. 24; 1593/4 Alard ibid. p. 30; 1593 Allart ibid. p. 29

Estonia

Middle Low German

● 1376 Aelhard BbRT p. 335; 1403 Aelhard ibid. p. 343

France

Latin

● c823 Adalardus (nom) irminon-vol2 39, Adalhardus (nom) ibid. 29, CE, Adalhart (nom) ibid. 71, Palatiolum; 940 Adalardus (nom) St-Barnard-Romans no. 88; 1047x61 Adelardo (abl) CartNDSaintes XV; 1101x1120 Adelardus (nom) CartStPC XXIV; 1101x1129 Adelardus (nom) ibid. XXII; a1114 Adelardus (nom) ibid. XXXI; a1116 Adelarde (gen) ibid. XX; 1138x62 Alardus (nom) clairvaux-12thc 59; 1147x62 Alardi (gen) ibid. 55; c1175–1180 Aelardi (gen) ChartCaen2 p. 66, Aelardus (nom) ibid. p. 62; 1179 Alardus (nom) clairvaux-12thc 176; 1224 Alardi (gen) ChartCaen2 16; 1378 Alardi (gen) hanquetvol1 839, Alardo (abl) ibid. 676, Alardus (nom) ibid. 1298

Old French

● 1268 Alart (obl) HistHdVParis p. 105; 1301 Alart (obl) MemPic-vol17 p. 287; 1313 Alart Paris1313 p. 33

Middle French

● 1366 Alart ActsCharlesV no. 320

◑ 1421 Alardin favier 412

Germany

Latin

● 842 Adalerdus (nom) quix-vol1 87; 1108 Adelardum (acc) ibid. 85; 1136 Adelardus (nom) ibid. 98; 1142 Adelhardus (nom) mairhofer XII; 1173 Alardus (nom) quix-vol1 81; 1231 Alardus (nom) CDL-1.1.1 XI; 1241 Alardus (nom) UrkMeck1 no. XXIX; 1257 Alardus (nom) ibid. no. LI; 1303 Alardo (abl) BremUrk2 no. 34; 1321 Alardum (acc) VFBStralsund 62; 1324 Allardus (nom) ibid. 85

Hungary

German

● 1313 Alardi (gen) Slíz pp. 15-16

Ireland

Latin

● fin12thC Adlard (nom) MunDocIr III, p. 6, Adlardus (nom) ibid. III, p. 18, Allardus (nom) ibid. III, p. 8

Italy

Latin

● 827 Adalhart (nom) FRA-XXXL 11; 828 Adalhart (nom) ibid. 12; 1265x1339 Adelardi (gen) BBC-Berg 342

The Netherlands

Middle Dutch

● 1382 Alert (nom) GesOIJ-4 p. 186