What would you do?

Am
Okay so my partner and I have decided on a name for our son...
I have one brother named Curtis. On my dads side of the family all the boys gave their children their brothers names as middle names and that's been my plan all along to follow family tradition. 
I had a daughter first and was told I'd never have anymore. Anyway 5 years later here I am, pregnant with my miricale boy and so this means more to me than anything. He's the only boy since my brother who's now 25 almost. 
Cutting to the chase, my partner says I'm not having it, he doesn't want it and that's that. I've fought my corner saying that if he didn't like my brother I'd understand and also offered to add his brothers name 'mark' in there too. Still to no avail. I really want this and it's hurt me that he's not seeing my side. What can I do?