Dictionary of Medieval Names
from European Sources

Allegra f. Latin alacer 'lively, cheerful, happy'.

Italy
Latin
1265x1339 Alegra (nom) BBC-Berg 277
1265x1339 Alegrina (nom) BBC-Berg 139
Cite as: S.L. Uckelman. "Allegra". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Allegra.