I wouldn't worry about the I moan thing. Lots of names rhyme with something or spell something backwards, but still get used, including very popular names.
Most people will quickly learn your pronunciation - I have a colleague Naomi who pronounces it Nigh oh me so that's how I pronounce her name. A relative's DD pronounces it Nay oh me so that's how I pronounce her name.
If you like it enough to use it I would keep the Naomi spelling.