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Dictionary of Medieval Names
from European Sources

Eustace m. Greek Εὔσταχυς 'fruitful, fecund'.

The name of three early saints, including a 2nd C martyr.

England
Latin
1279–80 Eustacius (nom) WaHR-SK p. 36
English
1530 Ewstace PP-HenV p. 15; 1586 Eustace DEmar-vol2 p. 13; 1593 Eustace ibid. p. 27
France
Latin
1079x1101 Eustachio (abl) CartStPC XXXVII; a1089x1101 Eustachius (nom) ibid. XXXIX; 1090x1101 Eustachius (nom) ibid. XLIII; 1093 Eustachii (gen) ibid. VI; 1101x1129 Eustachio (abl) ibid. XXIII; 1115 Eustachius (nom) CartNDJosaphat VI; 1120 Eustachius (nom) ibid. VIII; 1123 Eustachii (gen) ibid. XII; c1140 Eustachium (acc) CartNDdOurscamp LXXXIII; c1160 Eustachii (gen) ibid. XVI; 1208 Eustachius (nom) ibid. LXXVI; 1257 Eustachius (nom) ArrestReg-volI IX, Pentecost; 1259 Eustachius (nom) ibid. XXII, Pentecost; 1301 Estacius (nom) MemPic-vol17 p. 218, Eustachii (gen) ibid. p. 202, Eustachius (nom) ibid. p. 202, Eustacius (nom) ibid. p. 226; 1378 Eustachio (dat) hanquetvol1 237, Eustacio (dat) ibid. 538, Eustacius (nom) ibid. 1761
Old French
1327 Eustace lecoy p. 180, Eustache ibid. p. 180
Middle French
1388 Eustace thierry; 1418 Eustace HGParis p. 383, Eustasse ibid. p. 376; 1421 Eustace favier 845
Cite as: J. Uckelman, S.L. Uckelman. "Eustace". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Eustace.