I like the name and this spelling. I also pronounce it the same as you. I think Elle would make a cute nn for Arielle. As for combos, off the top of my head, I like:
Arielle Phoebe
Arielle Ivy
Arielle Tess
Arielle Sadie
Arielle Daisy
Arielle Freya
Arielle Faye
Arielle Sky
Arielle Gemma
Arielle Gwyneth
Arielle Eve / Eva
Arielle Esther
Arielle Hannah
Arielle Heidi
Arielle Jane
Arielle Jade
Arielle Joy
Arielle Kate / Katherine
Arielle Sabrina
Arielle Zara
Arielle Chloe
Arielle Charlotte
Arielle Violet
Arielle Beth
Arielle Mae
Arielle Matilda
Arielle Mercy
Arielle Maeve