Last name Kunhai (坤海 
, Kunhai 
) , around the globe, is a rare cognomen. The family name Kunhai is characteristic of China, where it is a very rare surname, Thailand, and Chile, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in China, Thailand, and South Africa. More frequently, Kunhai is the forename as well as the last name.