You are called that by immediate family members? Literally your significant other’s siblings calls you by his last name knowing you aren’t married??
I added the last part of their eventual divorce due to her infidelity because she was a nut-job. She had serious problems and intentionally (or not) would always be the antagonist In family drama.
So after 7 + years being married being a bridesmaid in my wedding and you don’t know my name, nor the actual family name of my children?? Sorry I’m not playing that game with you, sorry (this was just one of many things she would do and at that point I had enough of her to be quite honest)