In french, there are many female given names that are derived from male given names. Those names are often obtained by adding "ine", "ette", "e" or "a" at the end of the male name. Examples include
- Bérnard -> Bérnadette
- Claude -> Claudine, Claudette
- Charles -> Charline, Charlotte
- Paul -> Pauline, Paulette
- Gérald -> Géraldine
- Martin -> Martine
- Jean -> Jeanne
- Aléxandre -> Aléxandra
- Patrick -> Patricia
I might be mistaken in assuming that the male name came first for some of the above exampless. Consider also
- Sylvain -> Sylvie, Sylvaine, Sylvette.
Here, Sylvain is not the "ancestor" of the female counterparts but all descend from Silvanus who is a male name.
While it appears easy to find female names that derive from male names, I could not find any example of a male name that derived from a female name. In romance languages, are there examples of male given names that derive from female given names?
François -> Françoisefrom my list. You can post
Françoise -> Françoisas an answer.