Thanks for all the great suggestions! In the end, my niece wanted to call him Rocky so that was that.
It's amazing how many cat and other pet names wind up ending in a -y or -ie sound. Actually probably shouldn't be, but I can think of...maybe four* of the many, many cats we had that didn't have a diminuitive name.
That's a cute lil feller!

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.