What do you all think of the name Arena for a girl? Is it too abstract? Can you think of a middle name that goes with it?

and

my second choice for a girl is "Aria" which happens to be the same name a 'friend' named her baby girl 5 years ago (not a common name). This friend is on my facebook but we havn't actually communicated since high school almost 15 years ago. My sister seems to think its rude. WDYT?

TIA