I've pondered this question for ages, engaged now so myself and DP discussed it the other night.
I'm the breadwinner, fiercely independent and unapologetic for that. We split bills at restaurants and always have, I expect nothing financial from him, he'll be the SAHP when we have children and I guess in that sense, we're the opposite of a "traditional" couple.
I felt a bit weird about taking his name because it felt like I was about to give up my identity or something, and also I'd become the new "Mrs Hisname" which is what his Mum is always known as so it felt really, really odd. I told him this and told him I'd be keeping my name, he agreed this was all fine.
Then I woke up one day and felt really really sad at the prospect of not taking his name, and I don't have a clue why. I got really down about us never sharing a family name for some reason and I still can't explain why.
I went back to DP and told him this, and said that actually I think I wanted his name and he was over the moon. He'd been supportive, but inside he'd been gutted I wasn't going to be "mrs hisname" even though he'd said it was all ok.
As soon as I had time later to reflect on the new decision to be "mrs hisname" it just felt better, somehow right.
I don't know why and I'm not usually a believer in woo shite, but I genuinely think you just know what's right with big things like this :)