I suppose "Mark Twain", "George Orwell", "George Eliot", "Lewis Carroll", "Ayn Rand", "Richard Bachman", "Dr. Seuss", "Jane Somers", "A. Square", "George Sand", "Currier Bell", "Ellis Bell", "Action Bell", "John Reid", and "Ellery Queen" need to be informed (many posthumously by a number of decades, so good luck there) of this social convention that "is not something usual". Those are just novelists using noms de plume, BTW.

Update: s/noms de plumes/noms de plume/ after a discussion with ikegami over the humor of the former vs. the clarity and acceptance of the latter.