Russian Eastern Orthodox Old Church believers have fancy names, such as Evdokia (female) or Liverius (male). They are really uncommon because of a small population of Old Believers.
This person would probably be able to get away with living in the US without too many looks but this is a slang term for vagina in the UK so they might have a rough childhood there.
I'm in Finland, but most of the entertainment I consume is from the UK/US. Aoife just sounds quite different from all the other names I keep hearing so I assumed it's rare, but I'm glad to be wrong because the name is still cool.