named after a great warrior or somein like dat.
The Japanese call their country "Nihon" or "Nippon" because of it's kanji ( 日本 ). The first is the kanji for "sun", and the second is the kanji for "root". Together, sun+root= "from where the sun rises", making Japan "the land of the rising sun". The kanji used have a couple different ways of being pronounced, mostly a regional variance, hence "Nihon" and "Nippon" are both acceptable. Adding the suffix "-go", or sometimes "-ga", to a country name then refers to their language. "Nihongo" refers to the Japanese language. Another example would be "Supaingo", where "Supain" refers to the country Spain, and adding the "-go" refers to the Spanish language.
Japanese call their country "Nihon" or "Nippon".
Yes, but we call it japan because that is how it is translated in English.
nippon
The Japanese word for their own country - is Nippon.
nihon (日本)
Yes. You call Japanese people Japanese people.
日本  nihon or nippon
They call him Santakukoru.
Yen :)
If you are referring to "state", as in states (California, Washington, etc...) then the closest they have are prefectures. In Japanese they are called 県, or "ken". For example, Iwate prefecture is known as "Iwate-ken".
Japanese people call Christmas, Kurisumasu.