I think this will definitely spike in popularity in about ten years when today's teenagers start having lots of kids...Harry Potter has probably turned a lot of people on to it. It certainly could be worse, I don't mind it though I'm not a huge fan. It reminds me of
Briana /
Brianna.
I think either spelling is fine, but I pronounce them differently...I say ah-ree-AH-na for
Ariana and er-ee-A-na for
Arianna.