What a cutie. You are so lucky to have found each other.

I wouldn't worry about changing a dog's name, just because I'm remembering all the different nicknames our dogs had. Just like when someone comes up with a new nickname for you, dogs know you're talking to them just by context and inflection.

I think our attachment to our own names these days has more to do with the inconvenience of paperwork than anything else. Remember all the cultures that used to mark a major milestone in life with a new name. We still do it today in limited circumstances: changing a surname on marriage, joining a religious order. Why not let your dog mark his milestone the same way (not the way dogs usually mark milestones ).