I like
Lindsey.
I can appreciate it on a girl, it no longer seems too dated to me and sounds quite fresh
however, I love it on a boy. I don't think I would ever use it as a first name for a son as it is now so associated with females, however I think it makes a very handsome middle name. It's surname so quite on trend really when you think about it
I My favourite combo with
Lindsey is
Matthias Lindsey
~ Always end the name of your child with a vowel, so that when you yell the name will carry ~