Dictionary of Medieval Names
from European Sources

Hilary m. Latin hilarius 'cheerful, lively, light-hearted'.

The name of a 3rd C saint and martyr, a 4th C doctor of the church, a 5th C pope, a 5th C saint, and a 6th C saint.

France
Old French
1296 Alaire paris1296 p. 4
Middle French
1588 Hilaire raymond1588 p. 568
Italy
Latin
1376 Illario (abl) DouGen1 p. 45
Cite as: J. Uckelman, S.L. Uckelman. "Hilary". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Hilary.