I will take a running jump, and say, "Bet they got it from a book."
A novel, that's to say. Not a baby name book.
We have a friend, a priest (male, need I say), named Eymard.He's French-speaking, but is the only bearer of that name anyone knows..he says his mother ..got it from a book.
I also have a friend, Carlotta, not in the least Latina..same story.