And no if his whereabouts was known he should have signed for change oif namebut there are plenty of online single parent groups that will recommenced ahencoes to use for deedpoll that require minimal evidence to prove the non resident parent isn’t around.
Remember this won’t have been able to be used for passports etc.
He can go to court to get it changed back. But I’d think that at fourteen he needs to question that presumay his daughter was involved in the decision and even if he went to court to change it back in less than two years she could legally change it again.
Its commonplace for children to want to have the same names as those they live with.
Aa hurtful as he sees this. Is it in his child’s best interests to now kick up a fuss?