Well, I know this might be traditionalist and sentimental and not very creative, but my father named all his sailboats for his two daughters -- Mary-Bet. At least it made us kids feel involved and important and part of it all.
My sister and her husband named their catamarans "Mush Monk," which were based upon nicknames for their children.
And, guess what, all four of those kids (Mary, Bet, Mush and Monk) are sailors.