She really wouldn't have, but it can cause delays while they establish she's definitely the mother.Went to my son in laws Birthday BBQ over the weekend and his sister was there with their 5 week old son. She's not married to her partner, the father They've given him a double barreled surname, his and hers, because if the kid just had the dads surname, she would need to get his written permission to take the son abroad without him.
Making it double barreled prevents this. As the dad works on ships, it's a very good chance they'll go overseas to meet him at various ports in the future.
Apparently for kidnapping reasons.One aspect of double barreled surname I hadn't thought of.
The very simple workaround is you stick an official copy of the birth certificate inside the child's passport.
I know all this because my missus has no truck with marriage or double barreled surnames.