<human>: Could you distill the essence of the text into 1-3 sentences?

My girlfriend and I have been dating almost 4 years. Naturally we ended up talking about marriage and kids the other day when the issue of last names came up. First she mentioned she'd want to keep her last name after marriage; It made me sad (I guess I'm a bit of a traditionalist) but I understood her wanting to keep it. Then we got on the issue of kids and she said she'd also want her kids to have her last name. We've been divided on this issue for a few days now. 

Her reasoning: Her last name (decently common chinese name) has more history than mine (rare german, but not german-sounding last name). And she doesn't like my last name. 

My reasoning: I'm the only son my dad had. Of course I want to pass on my last name. When I asked if she expected her brother's kids to have his last name she said yes. And also implied she'd be more interested in taking my last name if it was chinese. 

Despite the fact that 'most other people do it so we should too' is a bad argument, I still feel as though I would be judged for having my kids have my wife's last name and that doesn't sound attractive to me. When I told her that she told me she couldn't believe I'm afraid my balls are too small that I wouldn't respect her opinion. 

Anyways, I really love this girl, hence why the talk was brought up in the first place. I feel like this is something so stupid to have an argument about but at the same time it's important?
<bot>: Girlfriend wants kids to have her last name. Mostly because she likes hers better. Felt like a slap in the face to me.