No. Not unless the court orders it. Many women decide to continue using their married name and for various reasons. That choice is up to you.
Well ! Yes.
No. She can change it back to any formerly used names upon divorce.
You can change your name back to your maiden name legally as a part of the divorce decree. If you would like to change your name back while the divorce is pending, you must go through a legal name change procedure.
No.
no, it requires the permission of the court.
No he can not take what is not in his name.
No you cannot change your last name before the divorce is finalized even in Nigeria.
yes especially if she is pregnant and they are pending divorce.
No, as that's a sign of parental alienation. see my profile
A woman doesn't have to take her husband's name when they marry. But most do. And the marriage document legally changes her last name to his. She has the legal right to continue using that last name as long as she wants, unless she stipulates in the divorce that she wants her maiden name back, or goes to court at a later date to have it restored. That doesn't mean she has access to anything in her husband's name once they are divorced. It simply means she has the same last name as he.
(in the US) Yes, it would be unlawful. No one but you can legally change your name. At the time of the divorce (especially if there were children of the marriage) you will be given a choice as to whether you wish to keep your married last name or revert back to your maiden (nee) name. However, if there were no children of the marriage, the court might inquire as to why you wished to keep it - but your ex-husband would not have the power, by himself, to change it.
No, if you divorce it does not automatically count as a legal name change in the USA. You can still use your married name the rest of your life, although this is uncommon. Most divorcees change back to their maiden name after divorce.