The effect that creates a token may set the name of that token. A token that’s a copy of something else has the name of the object it’s a copy of, unless otherwise specified. All other tokens have a name that matches the subtypes of the token that was created plus the word “Token.” For example, an effect that says “Create a 1/1 green Elf creature token” creates a token that’s name is “Elf Token.”

To determine the number of differently named tokens you control, count each token you control once, but only if its English name isn’t the same as another token you’ve already counted this way. For example, if you control two tokens named “Elf Token” and one token named “Goblin Token,” you exile two cards from the top of your library.