My partners surname was changed by deed poll as a child. His name on his birth certificate is his old one. The registry office have told me it will be his old name on the marriage certificate but he will be referred to by his new one in the ceremony. I want to change my surname to his new name, however now won't be able to use the marriage certificate as a proof of name change, will I have to change my name by deed poll also? Or can I use my marriage certificate and partners deed poll document as proof of name change? He's had it done by a solicitor at the age of five and his passport etc are all in his new name so I'm not sure how it will work, any help is much appreciated!