Nihon and Nippon both means Japan.
Nihon and Nippon are both Japanese ways of pronunciations to read Chinese letters indicate Japan.
I consider that the sound of "Japan" for Nihon derived from Chinese way of reading of Nihon. In Chinese they pronounce Zuban. In ancient world, Nihon changed to Japan on the long way to English speaking world.
Japan in Japanese. Translates to "sunrise land" or "land of the rising sun".
Wanna take a trip to Japan? The cherry blossoms are about to be in full bloom.
Ah, you mean nihon? And yes, the sakura is nice.
Dude, why are you being so cringe? Don’t use Japanese words randomly while speaking English, only weeaboos do that.