nina or enna would make more sense.
enna is one in Greek, so I doubt that would fly.
Ena is one, but you are right that it's too close. Guess you would have to add the e back then, and do ennea. Enneabyte is a crappy word.
Ennea is nine in Greek, at least phonetically.
I'm glad there weren't any references to 9 earlier in the thread...