This is only half a memory ... in a series of British detective novels, and I can't remember either the author or the main character, there is an artist named
Agatha Troy who always goes by
Troy. (I'm thinking the author may well have been
Ngaio Marsh, in which case she was originally from New Zealand.) So in the world of the books, it would have been a ln used as a fn, perhaps to avoid the then-dated
Agatha.