can a married woman keep her ex husbands name and be called ms?

Yes, a married woman can choose to keep her ex-husband's last name and be referred to as "Ms." This is a personal decision, and many women opt to retain their previous names for various reasons, including professional identity or personal preference. The title "Ms." is neutral and does not indicate marital status, making it suitable for women regardless of their current relationship status. Ultimately, it's up to the individual to decide how they wish to be addressed.