I can't get past Hillary Clinton to tell you the truth. I just can't see a cute little girl called Hillary. But thats just my opinion and its your baby, you can call it what you want. I wouldn't use Ari for a girl as I'm into pretty and feminine type girls names. Have you considered somthing that sounds similar to Ari?

Ally
Audrey
Airlee or Airleigh or Airley
Marley

A question for everyone: how do u pronounce Arianna? Ari - arhn - na or Ari - anna?