It's more than celeb trendy at this points; it's been blazing up the charts with commonfolk for quite some time now.
I'm not a fan of
Ava myself, but if you want to use it, I don't see a logical reason why you shouldn't. Just because it's popular doesn't mean you loose any namenerd cred (in my opinion at least). As long as you don't pair it with
Elizabeth,
Grace, or
Emily. ;)