Cognomen Khaiko (Khaiko 
, Хаико ) , in all the world, is a very rare last name. The last name Khaiko is habitual in Belarus, where it is a very rare surname, Russia, and Germany, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Russia, Belarus, and India. More prevalently, Khaiko is the forename as well as the last name.