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.
Cite as: J. Uckelman, S.L. Uckelman. "Louisa". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 1. http://dmnes.org/2016/1/name/Louisa.