To change my daughters name

[rabbitrabbit12]

I'm currently arguing with my exh regarding changing my 12 yr old daughters name. All I would like to do is add my maiden name to my daughters name as a middle name on her passport. This is so it shows a link between us as we travel abroad frequently.
I've explained to ex the reasons and that it wouldn't change her name day to day so I don't see why he's against it... aibu?

It's such a hassle to change your name. I had my name changed when I was 6. THen changed back without my knowledge and then had a whole heap of hassle when I got married as I had no proof of change of name (there is no official records kept so you can't get a replacement document).
She's still your daughter.