Name trouble!

So our baby has been nicknamed ‘Ted’ since before we even had a scan! And my partner agreed that if we gave the baby his last name then I could choose the first name. So since about 18 weeks he’s been called Teddy-George which I adore and have personalised stuff with Teddy on already but my partner has now said it’s stupid and he should be named Theodore or Edward on the birth certificate but nicknamed Teddy. I don’t like either of those names and don’t ever want anyone to call him that which they would if it was on his legal documents like at school etc.

I don’t want him to dislike the name of our child but I don’t want to put a name I don’t want him being called on the birth certificate just to keep him happy! I just don’t know what to do :(