"Neytiri" actually means "Wants Life" - which I actually think is more perfect, given her choices in canon and how I view her.
As for the others, I'll just copy from my own notes what I've worked out and conjectured (I've been working on a number of original names and things for stories, as well as poking at the names mentioned):
Mo'at, according to the original script, means "dream catcher" - so I'm assuming here that both 'mo' and 'unil' mean dream (maybe 'mo' is more of a dialectal word that universal Na'vi), that 'at' can mean 'catch' and 'catching' without needing to have a 'yu' on the end. Which I admit is conjecture, but ah well.
Eytukan's name...I have no idea. In pure sound, it alludes to eyktan, leader, but when I break it down, I get the following:
So, could have connotations of "first aim", "leads the arrow", or something like that - like Ninat, I don't think it's a name that has a literal meaning in English.
Possibly - I fully admit that I've done all of the above myself, so, you known, YMMV.
