A name is all about the owner, not the boat. The boat could care less--- it's just a bunch of fiberglass, wood, and metal components fastened together in one lump. The soul of a boat is in the beholder, not in the boat. The boat isn't going to do anything different no matter what name you give it or how many times you change it. This "soul" crap is no different than Disney humanizing elephants, mice, and dogs. Whatever "soul" you give a boat is in your mind, not the boat's.
We chose the name of our boat because it means something to us, not because it has anything to do with the boat. If we'd bought a completely different kind of boat, we'd have given it the same name. In fact we came up with the name years before we decided to buy a cruising boat. Buying the GB finally gave us something to put the name on. If we ever buy a different boat, we'll give it the same name.
So change the name whatever you want. If you decide to change it later, no bad luck will ensue unless you screw up or make mistakes. The boat's not going to do anything on its own. If you want to have fun with a name changing party, that's fine--- it's a good excuse to have a party. But whatever happens to you with your boat in the future, it will have nothing to do with the name you give it or the ceremony you did or didn't have.
I know people who left the name of their boat what it was when they bought it, and I know some people who've changed the name of their boat three times since they bought it. All these folks have done just fine.
And I've found a surprising number of people do, in fact, name their cars