I like it better for a girl than for a boy, but it feels very 90s... I like
Alexa better.
Hard to really count how many off the top of my head...
I also know an
Alejandra and an old family friend has a little boy named
Alejandro.
They're all somewhat common, with the possible exception of
Alexandria... However, as long as you pair it w/ something less common, it could work.