You're not getting it pink your husband might not have personally 'went mental' at you. Although we've already seen that some do.
There's direct pressure and indirect pressure. It's pressure because it's tradition, it's the done thing, it's the norm, it's what most people do.
We grow up with it without questioning it.
Of course your husband could have changed his name. Plenty of women use their maiden name for their professional life but legally change their name.
I think if you were honest business or no business he wouldn't have considered changing his name and you wouldn't have considered that he might.