What a fun thread! I don't have much to add, but here it is:
The old maritime tradition is that you name your boat after a female beloved, like your sweetie or mistress or daughter or ??, for good luck. I figure in river rafting, it's flip insurance (right?). My boat (Aire 143E) is the "Lil' Robin", named for an older sister who I never knew, cuz she died in infancy. Not keeping with tradition, my lake boat (a 20' outboard) is the "Toybox", cuz of all the skis, wakeboards and tubes that it hauls. My Grandad had many motorboats (being a Johnson outboard dealer), back in the 50s-60s that he ran on rivers (mostly Glen Canyon and other parts of the Colorado) and they were all named "River Rat". He would just add a number behind the name....I think the last "River Rat" was VIII !
And to close, a tech tip: Vinyl repair paint, available at auto parts stores, is a good and economical alternative to urethane paint for putting a name on a raft. It's not quite as durable, but I've been happy with it and it's a lot cheaper and easier to apply.