I like it too, it reminds me of the word "musical" and "nautical" at the same time, so I think of the sound of the ocean when I see it, and the dark, angry navy colour of a rough sea. But it kinda looks, at first glance, like it should be said in a way that evokes the word "nausea", which is really too bad.
I'd say it "NAW-sih-sah" or "naw-SEE-say" or "NAW-see-say", but I bet those are waaaayyyyyyyyyy off.