Cognomen Kilbas (Kilbas 
, Килбас 
) , around the globe, is a rare surname. The surname Kilbas is habitual in Belarus, where it is quite a rare surname, Russia, where it is a very rare surname, and Kazakhstan. Measured by absolute frequency, it is the most numerous in Belarus, Russia, and Philippines. Very seldom, Kilbas is the forename as well as the last name.