Goryeo(Region)Korean Possibly means "walled city" or "center" in Korean. This was the name of a kingdom that ruled most of the Korean Peninsula. The name Korea is based on it.
Hanguk(Region)Korean From Sino-Korean 韓 (han) meaning "Korea" and 國 (guk) meaning "country, land". This is the term used in South Korea to refer to South Korea or the entire Korean Peninsula.
Indo(Country)Japanese, Korean Japanese and Korean form of India. It is usually written in katakana in Japan and Hangul in Korea.
Joseon(Region & Country)Korean This was the name of two kingdoms in the history of Korea. The first was conquered by the Han Empire in the 2nd century BC. The second ruled Korea from the 14th century until the 19th century. The name of these kingdoms was written using the Sino-Korean characters 朝 (jo) meaning "dynasty" and 鮮 (seon) meaning "new", though the actual origin is assumed to be Korean. This name is now used in North Korea to refer to the country of North Korea.