It would be worth your while contacting someone regarding the law on this, as if a change of name will make them safer, or that you were coerced into giving your baby his surname, there could be grounds for you to change it.
Although, as far as I’m aware if you hold parental responsibility and his is removed, then he has no say in this, again, best to check with a legal consult, you could try Rights of Women, although it could take some time to reach them, they would be able to answer this without incurring any costs for you.
warmest wishes
ts