He was born with the name Borjigin TemujinBorjigin was his clan name (or family name) as we would know as last namesClan names went first according to tradition so switch the order and his name is...
Kahn means king. Some people called Ghengis Kahn Kahn of Kahns or King of Kings. although nobody knows what Gehngis means, many people think it is a word for spirit of light