Aibu to want ex to change his surname?

[Rebecca2014]

When we got married my ex took my surname as he hated his own family surname.

We have now been separated for a month and he is still using my surname, I thought he would have changed it back to his family name? I have asked him a few times and his just told me to leave him alone!

I am worried if one day he remarries or has another child he would give them MY family surname. Would that even be legal?

Aibu? If he legally entitled to use my surname even after an divorce?

I know this is petty but it bothers me as he was such an dick to me in marriage.

Ooh I really want to know what his surname was before he changed it now. Something embarrassing like Trumper, or socially awkward like Hitler? (Apologies to any MNs who have the names stumper or Hilter btw)

Trumper

2014 is a silly surname anyway.

YABVU.

It's his name as much as it is yours now, you had no right to ask him to change it.