Dictionary of Medieval Names
from European Sources

Gailhelm m. Proto-Germanic *gailaz 'merry, excited; beautiful; lush, lustful' + Old High German, Old Saxon helm 'helmet'.

Spain
Latin
1488 Gaillelmus (nom) carbonell-I p. 22
Cite as: S.L. Uckelman. "Gailhelm". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Gailhelm.