I’m sorry you’re having to start from scratch…I totally sympathize with how hard it is to find a name that you both agree on! There are some really beautiful suggestions here from other posters, but…
I followed the comments on the last thread you posted, and I’m going to offer a dissenting opinion: if you really love the name [name_f]Scarlett[/name_f], and it’s the only thing you both agree on:
GO FOR IT!
Sometimes when using public opinion for help with naming a real little person it’s helpful to remember that this is a baby naming forum, where most of us scrutinize names, think about them way too much (
), and really delve into meanings in a way that 99% of people never will! It’s an amazingly wonderful and helpful resource, but, realistically, most people your daughter meets are not going to hear her name and think “oh [name_f]Scarlet[/name_f]; that’s related to the colour red; and your last name is [name_m]Brown[/name_m]. weird”!
I guarantee I could do a social experiment with people in my own family, and they would just say “oh that’s lovely name” and move on.
Yes, she may get occasional observations about how both her names are connected to colours from those who are especially thoughtful about these things, but I would put my money on it that most people won’t even make the connection. ([name_u]Or[/name_u] at the very least, they won’t think about it long enough to get there!) And for those who do put it together, I don’t think it’s a massive issue.
It would be different if you were thinking of calling her [name_u]Blue[/name_u], or a really obvious colour name, but in this case I think the name is beautiful and stands on its own enough without being seen solely as a colour descriptor.
In my mind, it is far more important to choose a name that both you and your partner love, rather than settling on something neither of you agree on, and that will always rank second to your first choice.
Anyhow, I just wanted to throw that out there in case you needed to hear it 
Good luck!