Last name Sergan (Sergan 
, Серган 
, Сергань ) , in all the world, is a rare cognomen. The family name Sergan is habitual in Slovenia, where it is quite a rare surname, Ukraine, where it is a rare surname, and Russia. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Russia, Ukraine, and Romania. Very seldom, Sergan is the forename as well as the last name.