Kostya is a Russian diminutive of Konstantin, which itself is derived from the Latin name Constantinus. The name Constantinus is a hypocoristic of Constans and Constantius, both meaning "constant, steadfast" in Latin. The name has been popularized by historical figures, particularly Roman and Byzantine emperors, starting with Constantine the Great. In Russian culture, Kostya is a common short form of Konstantin, reflecting a sense of familiarity and endearment.