Kostas or Costas (Greek: Κώστας) is a Greek given name and surname. As a given name it is the hypocorism for Konstantinos (Constantine). Given name. Costas Andreou, Greek musician. Kostas Antetokounmpo (born 1997), Greek basketball player. Costas Azariadis (born 1943), Greek economist. Kostas Biris (1899–1980), Greek architect. Costas Georgiou (1951–1976), Greek Cypriot mercenary. Kostas Lazarides (born 1949), aka Kostas (songwriter), Greek-American country music songwriter. Costas Mandylor (born 1965), Greek Australian actor. Kostas Papanikolaou (born 1990), Greek basketball player.
https://en.wikipedia.org/wiki/Costas