After reading my first book, Rising Storm, although I had noticed that the leaders all had names ending in -star, I did not notice that all apprentices' names ended in "paw", and I think the only named kit was Bramblekit so I didn't know that pattern either. Basically, I just thought they had one name that they kept through their lives unless they became leader, upon which the last part would be replaced with -star. So when making a Clan based on my Beanie Babies, I had, like, a kit named Pinknose and a deputy named Nightpaw.
I also had named one of my earliest fanfic characters "Mayflower" (after a wildflower
that I've always been fond of; its real name is Wood Anemone but "mayflower" is a common nickname for it and all I'd known it to be called.) Later upon realizing that it wasn't a great warrior name, and learning the official name for the flower, I renamed her "Woodflower".