I'm surprised it's still in the submitted names and not the main database.
It's more pseudo-Irish than pseudo-Latin IMO ... the Latin-like feminine "a" ending, tacked onto an Irish name without changing the Irish. It's more like
Alberta than it is like
Ludovicus.
But BtN doesn't stand behind what name submitters say. It just says
Seanna is a feminine form of
Sean.
It's one of the few names I prefer with two Ns -
Seanna. I like it that way. I also like
Deanna more than
Deana. For some reason
Seanna looks more like it's
Shawna, and Seana looks like See-na to me, the way
Deana looks like Dee-na.
- mirfak