Anybody who thinks that Japanese people don't call
their country Nippon need only go to the bank
and buy some Japanese money. Printed on every yen
note is the inscription Nippon Ginko, which means
Bank of Japan. Or you could ask a Japanese person.
In fact, Japanese people call their country
Nippon, Nihon, or Japan depending on who they are
talking to, and how they feel at the time.