My biological father which I like to call my sperm donor was adopted when he was a child by his step father. I don't have a close relationship to them what so ever, I don't speak to him much, and my memories of him growing up are not fond at all. I remember him physically beating my mother when I was a young kid, I remember him telling me all sorts of bad things about my mom trying to convince a 10 year old to tell the courts that "I want to live with my dad". I remember him telling me that he would kill her if it weren't for me. I was 12 or 13 when he told me that and my reply was: "if you harm my mother one bit I will kill you" So to say that my sperm donor's last name doesn't mean anything to me is an understatement. I've been wanting to legally change my name to my mothers and today it's official. It's a big pita since I wasn't born here in the usa but I will end up getting my birth certificate changed, ss card, Pistol license, license, insurance, car insurance, bank accounts, ect. But it's worth it in the end, I'm truly happy with my decision with changing my name.