I am 40+4 and we had decided on another name for DS2 (Finn) but I find myself rather taken with the idea of Darcy instead....in no way related to watching the old BBC Pride and Prejudice on Netflix, oh no...!
I'm biased as I have a DD called Darcey so consider it a girls name but I've also come across a few other Darceys / Darcys and they are all girls. Though I am aware that it can be a boys name - particularly in Oz.
I personally think Darcy sounds more suitable for a boy (maybe because the first one I ever heard of was the bass player Mark King's son?) but because it's now quite popular for girls, I'm not sure if I'd actually use it for a boy. He could end up like the boy Courtney I knew a few years ago, who ended up calling himself CJ when he was old enough to have a say.
I love it for either gender really, but since Pride and Prejudice is my favourite book, and I practically worship Jane Austen, I'd choose it for a boy. My mother's still secretly (or not so secretly) hoping that when I have children, I'll have twin boys named Bennet(t) and Darcy