For the longest time, any cat we named "Colonel Mustard" was reclaimed by their owner.
Other than that, I just keep a running list of names that I randomly think of on my phone using Google Keep. We use pun names (Catalie Portman, Cindy Clawford [she had bikini markings], Purrsephone, etc.), pop-culture names (Superheroes, TV and characters, video game characters), Food names (berries, breakfast foods like pancake and waffle, pasta names, candy names), names from books (my favorite is probably Tom Bombadil), and we've also used the names of famous people broken up over multiple animals (usually for kittens, ex: Wolfgang, Amadeus, and Mozart).
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