I don't like it at all. I much prefer
Naomi,
Leona, or
Naima.
I don't think it really needs a nickname, but since friends and family often will shorten even the shortest names (my sister-in-law
Lisa gets called "
Li," hehe) I could see something simple like Nee (I really dislike the sound of "Oma," but I suppose you could use that too).