From wiki:

The similar sounding adjective "Nubian" used in the movies to refer to Queen Amidala's ship is cause for some confusion. Nubian refers to the planet Nubia, not to Naboo. The most correct adjective form of Naboo is "Nabooan" based upon an indigenous wild panther known as a "Nabooan tusk-cat".

Who knows if this is correct - it's wiki, after all. I'm guessing the wiki page that used "naboobian" was this one:

http://en.wikipedia.org/wiki/Xhonzi

Sadly, though Wookieepedia has an extensive article on Naboo, it doesn't say anything about this subject.

EDIT: Wookeepdiea: http://starwars.wikia.com/wiki/Nabooian

EDIT 2: What the hell does this mean (from the above article):

Kaadara developed as a coastal town for the few Nabooan fisherman (not to be confused with nabooian)

I give up.