Leonia

Also Dutch: https://www.meertens.knaw.nl/nvb/naam/is/Leonia

Also Flemish: http://www.names.be/meisjesnamen.html?met=Leonia&sort=alpha

Leonia is also Polish. The name days for Leonia in Poland are January 4, April 22, and June 18.

Also Italian: https://it.wikipedia.org/wiki/Leonio -- mention Leonia as a feminine form

Also Polish: https://pl.wikipedia.org/wiki/Leonia
https://pl.wiktionary.org/wiki/Leonia

Also used in Poland.

Also Italian usage.