Husband wants to take my last name

So I’ve told my mom that we do plan on getting married. We’ve been together for 4 almost 5 years and are expecting our first(and hopefully last) child together and we’ve said that we both want the baby to have my last name. He wants to take my last name because his real dad is a POS that he wants nothing to do with and has never been there for him because he never wanted a son. He even went to live with him when he was 11 because his dad wanted him there and he was there for a month before he was put back on a plane to come back to Missouri. He hates having his fathers name.

I told my mom about him wanting to take my last name because he loves me he wants the same name as his child and his real dad is a POS. She told me that my family would be pissed about it because your last name is your history and he isn’t an *last name*. She said they probably wouldn’t want us around and my baby is the first one of us that will have been born since I was born. I told her about my cousin that was adopted and his last name was changed to my last name he isn’t really an *last name* but we love him the same. She said she’s just looking out for my boyfriend because she knows them better than I do and doesn’t want us excluded.

It’s 2019 traditions be damned for all I care. We aren’t married, clearly we had sex before marriage, and he wants to take my last name and I love that idea. Not exactly the “traditional” way of doing things. I love that he loves me so much that he wants to and I wouldn’t want to get rid of my name because it’s just so different and unique. Don’t come on here saying my mom is just being a b*** she’s my mother and I won’t have her disrespected and because I do believe her a little bit because I don’t know my family that well since I’m the youngest and so separated from everyone.

I’m just looking for advice have any of you done it? And how was the process? And how did your family react?