Xausted, to me my surname IS who I am. In our case, because my name was important to me & DH didn't feel his was to him, he decided to take my name when we got married. Fine, all happy. Then he told his parents. Despite being the youngest of 3 boys, & there already being 2 grandsons with the (very common) family name, his parents went ballistic at the idea. Threatened to disown him etc. (20 years later I'm wondering why we didn't just say fine, do what you like..).
Caused a bit of a wedge between me & them because it made our lives far more complicated than they needed to be. When we had DD & double-barrelled, the solicitor doing the Deed Poll insisted on interviewing DH BY HIMSELF, to check he really wanted to do it!! (I didn't have to sign it, incidentally, because the form says "take this name for myself, my wife and wider issue"... ie I still don't count!)
Since then, all my family, and the PIL have managed to address us as Mr & Mrs X-Y, but his brothers, uncles & wider family have refused to do so, which TMM is very rude. Fair enough to send cards to Mr Y, but when they send me things to Mrs Y (not my name) or worse Miss/Master Y it really puts my back up.
The first time I heard DH on the phone saying "this is Mr X" I was surprised, then quite annoyed that he could have saved so much hassle by sticking to his own ideas in the first place! He is Mr X at work, I am Mrs X at work... DD refuses to use DHs surname at all, & registered herself at school using only mine....