There are many different names for Polydactyl cats.
Hemingway cat, or simply Hemingway
Boxers or Boxing Cats
Boston Thumb Cats or Bostons
There are poly's that are native to Ithaca, New York, that are known as "Ithacats".
Famous Polydactyl-President Theodore Roosevelt had a poly named Slippers. He was one of the first cats in the White House and was very popular at official functions and press conferences.
I prefer to be called a Boston, or Hemingway Cat. If I was a street cat, I'd go by "Boston" and have a scar on one cheek and have a New England accent. I'd say "Mee aah" instead of Meow. Chicks dig the scars. Linus is not a very dangerous sounding name. But you are what you are, and I'm proud to be different.