I just named a character Booker, then another Casper. Then changed Booker to Casper and Casper to McCoy. Lol. I like to think these are last names but I don't really care because they're only appearing once.
You can used random name generators, the combinations that pop up are really fun. If a character needs to have a meaningful name, I look through name lists (I think authors look through name lists more often than expecting parents, lol). Sometimes I just KNOW what a character's name is the moment I start writing them.
I had a character I named Philip, and he hates horses. And it wasn't until I checked, that I realized that Philip meant lover of horses. What a coincidence 🤣