Namesakes
Greek Prime Ministers:
2 prime ministers
Kostas Simitis 1996-2004 
Kostas Karamanlis 2004-2009
Hall-of-Famers:
1 ice hockey
(ice hockey) Chris Chelios (a.k.a. Kostas) 2013
Notable Athletes:
3 soccer, 1 ice hockey
(ice hockey) Chris Chelios (a.k.a. Kostas) 1962-
(soccer) Kostas Katsouranis 1979-
(soccer) Kostas Mitroglou 1988-
(soccer) Kostas Manolas 1991-
Olympic Medalists:
1 gold, 1 silver/bronze/gold
(silver/bronze/gold) Konstantinos Tsiklitiras (a.k.a. Kostas) 1908; 1912 high jump - standing; long jump - standing
(gold) Kostas Kenteris 2000 200 m