Howdy. So like, I first made the name Riverpuppy, which was a combination of my favorite "main" element (water) and my favorite animal (dog, puppy), and it was only used for this game called Transformice that I used to play. This was back when I first started actually liking computer games and online stuff, so I branched out to find more and changed the name to Riverpaw because the 'paw' represents my love of all animals, not just puppies.
And before you ask, I had NO IDEA what Warriors was when I made the name, so the fact that it happens to be an apprentice name is purely coincidental. I did start reading Warriors when I found out though. If you don't know what Warriors is, it's this book series about forest cats, and the young cats in training always have 'paw' at the end of their name.