Riquier is a Norman and Picard form.
The German vernacular form Richer is witnessed between 1074 and 1087 in the place name Richersperga (UrkStyr 77).
  
  
- Austria
- 
- Latin
- ● 813 richarius (nom) UBEnns-1 II;
 c1070 Richer (nom) UrkStyria 69
 
- England
- 
- Latin
- ● 1181 Richerus (nom) StPaulDom p. 117;
 1185x1186 Richerus (nom) PR-XXXVI p. 13;
 1189 Richerius (nom) GASurv p. 129;
 1222 Richeri (gen) StPaulDom p. 79
- Walloon
- ● 1582/3 Ricquier RWC p. 5;
 1590/1 Riquier ibid. p. 15;
 1591 Riquier ibid. p. 18;
 1591/2 Riquier ibid. p. 19;
 1592/3 Riquier ibid. p. 25;
 1593/4 Riquier ibid. p. 30;
 1594 Riquier ibid. p. 33
 
- France
- 
- Latin
- ● c823 Richarius (nom) irminon-vol2 28, Palatiolum,
 Richerius (nom) ibid. 94, Ved;
 11thC Richer (nom) StVdM-II 710;
 1126 Richerius (nom) CartStPC IV;
 1142x1152 Richerio (abl) ChartCaen2 1;
 1147 Richerio (abl) clairvaux-12thc 19,
 Richerius (nom) ibid. 15;
 1179 Richeri (gen) ibid. 181,
 Richerus (nom) ibid. 181;
 1222 Richero (dat) NDParisII 2-XCI;
 1274 Ricerius (nom) RHF-VIII p. 59
- Old French
- ● 1301 Rikier (obl) MemPic-vol17 p. 241;
 1313 Richier Paris1313 p. 20
- Middle French
- ● 1388 Riquier thierry
 
- Germany
- 
- Latin
- ● 822x875 Recheri (abl) TradCorb §139;
 c1070 Rihheri (gen) UrkStyria 72;
 1130 Richeri (gen) quix-vol1 63;
 1135 Richerus (nom) ibid. 64;
 1142 Richerus (nom) mairhofer XIII;
 1151 Richerus (nom) ibid. XXXVI;
 1157 Richero (nom) quix-vol1 44;
 1168 Richero (abl) ibid. 65;
 1173 Richero (abl) ibid. 99,
 Richerus (nom) ibid. 81
 
- Italy
- 
- Latin
- ● 828 Rihheri (nom) FRA-XXXL 13
 
Cite as: J. Uckelman, S.L. Uckelman. "Richer". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Richer.