Some standard ones:
Auri
AuraAuro
Aury
Rora
Rori
RoryAur
Aro
AraAriRor
Roa
Ora OriOry
Orry
Orri
And some that are more of a stretch:
Roran (more of a tomboy nickname, using the diminuitive suffix "-an")
Arrow (from the "Auro-" part)
When I had a dog named
Aurora I would call her "Wowa" a lot (like a little kid trying to pronounce "Rora") but I think that only makes sense for a dog! :P