Big no on a girl.
For the longest time I was supremely neutral on it for a boy too, maybe even teetering on distaste. But ever since I became a bigger fan of the X-Men's Wolverine, I've softened my stance and can sort of see the appeal. Sometimes it takes a fresh perspective or a particular someone to warm you up to something. I would certainly not choose
Logan for a future son, it's not even close to my Top 25, but when it's on Wolverine? I grow somewhat fond of it in the moment.
All in all
Logan a strictly male name to me.