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Dictionary of Medieval Names
from European Sources
☙

Frederica f. Fem. of Frederick.

Withycombe s.n. Frederica says that this name wasn't used in England until the 19th C, but this is not the case.

England
Early Modern English
● 1543 Frederick StAnthonlin p. 4
Cite as: S.L. Uckelman. "Frederica". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 3. http://dmnes.org/2015/3/name/Frederica.