In my game, I don't want the player to be able to pick a name already in use by another character. But when I use this code:

  python:
        playername = renpy.input("Choose your name or press enter to use the pre-selected name of 'Blake'.", exclude="Lily Joan Nikki Terra")
        playername = playername.strip()

        if not playername:
            playername = "Blake"

I can't type the starting letter of any of the names. I just want specific names off the table. So I don't want the player to be able to call their character "Lily" or "Joan" or "Nikki" or "Terra". But I do want them to be able to pick the name "Lucy" or "Jolene" or "Noah" or "Thea".

How do I go about banning very certain names while allowing others of the same starting letter? Can I do that? Or do I need more lines of code in order to be able to execute this properly?