John Wayne's real name is Marion...so times definitely change.
I wouldn't think of Marion as a girl's name at all. I would think of Marian as a girl's name.
I kind of like using so-called male gender specific names for names for women (e.g. Sydney, Michael). And, as has been pointed out in other posts, those "rules" change over time (e.g. Marion, Lesley).
I've known guys named Sidney and Leslie, but not Sydney or Lesley.
I had the opposite problem as a kid - a name so common that there were always 4-5 of us in the class in elementary school.
Same here. In fact, my first and middle names are among the most common given to boys, and have been for decades. It's my last name that gets the most comments from people.
We gave our son a unisex name (Cameron), although we didn't choose it for that; we just liked the name.