There were several different names for the Nine-Tailed Fox throughout development: Ezreal himself referred to the Nine-Tails as Gumiho (구미호). The more common name Kumiho is a direct reference to the Nine-tailed fox from Korean mythology. A player found a poll for her name on the Riot Korea webpage, which gave 6 different options to vote for:
Danbi (단비) (meaning Saviour or Saving Rain)
Nabi (나비) (meaning Butterfly)
Ruri (루리) (meaning Dazzle)
Ari (아리) (meaning Graceful or Elegant)
Chorong (초롱) (meaning Glittering)
Dasom (다솜) (meaning Loving).
Ahri is voiced by Laura Post.
Ahri was simultaneously released (on all servers) with the launch of the Korean servers.
Ahri's dance is based on the choreography for the song Run Devil Run by Girls' Generation (소녀시대; So Nyeo Shi Dae/SNSD), an extremely popular Korean girl group. A side-by-side comparison can be seen here.
Interestingly enough, this girl group consists out of nine members, which could be a reference to Ahri's title (the Nine-Tailed Fox).