Last name Haigan (海乾 
, Haigan 
) , worldwide, is a rare cognomen. The cognomen Haigan is habitual in Georgia, where it is a very rare surname, China, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in China, the United Kingdom, and the United States. More prevalently, Haigan is the forename as well as the last name.