Dictionary of Medieval Names
from European Sources

Gailhard m. Proto-Germanic *gailaz 'merry, excited; beautiful; lush, lustful' + Old Saxon hard, Old High German hart 'strong, hard'.

France
Latin
1273 Galhardi (gen) RegToul-13thC p. 30, Galhart (nom) ibid. p. 23; 1283–86 Gailhardus (nom) GasReg-A; 1304 Galhard (nom) ibid.; 1310 Galhardus (nom) ibid.; 1310–11 Galhardus (nom) ibid.
Old French
1296 Gaillart paris1296 p. 47
Cite as: S.L. Uckelman. "Gailhard". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Gailhard.