Najee -- ??? No idea. It almost reminds me of something Sanskrit, but I'm not sure at all.
Pranav -- this seems Sanskrit or some form of Hindi to me, but that's just a total guess
Nikhil -- maybe somehow related to
Nicholas, but who knows?
Nicklaus -- definitely related to
Nicholas, but does anyone know where it's origin is?
Nathen and Nathanial -- just modern respellings of
Nathan and
Nathanael or something else crazy?