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Dictionary of Medieval Names
from European Sources

Louisa f. Fem. of Louis.

Withycombe's earliest example in England is from 1646; but the name was used by women there earlier. It was, however, never common in any culture, certainly not as common as its masculine counterpart.

England
Early Modern English
1565 Lewes BEmar-vol1 p. 8
France
Middle French
1421 Loyse favier 1270
Italy
Latin
1522x1532 Loysa (nom) DSF p. 51, 18; 1527 Ludovica (nom) Rome1527 p. 83
1522x1532 Loysella (nom) DSF p. 53, 38
Spain
Catalan
1510 Luisa valencia1510 3704
Cite as: J. Uckelman, S.L. Uckelman. "Louisa". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 3. http://dmnes.org/2015/3/name/Louisa.