Dictionary of Medieval Names
from European Sources

Felicitas f. Latin felicitas 'happiness, luck, good fortune'.

France
Latin
a1163 Felicitas (nom) clairvaux-12thc 96; 1164 Felicitas (nom) ibid. 120; 1179 Felicitas (nom) ibid. 177, Felicitatis (gen) ibid. 179
Italy
Latin
1527 Felicita (nom) Rome1527 p. 87
Cite as: S.L. Uckelman. "Felicitas". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Felicitas.