Namesakes
Icelandic Presidents and Prime Ministers:
1 prime minister
(prime minister) Hannes Hafstein 1904-1909; 1912-1914 
Nobel Prize Winners:
1 physics
(physics) Hannes Alfvén 1970
Notable Athletes:
1 soccer, 1 track
(track) Hannes Kolehmainen 1889-1966
(soccer) Hannes Þór Halldórsson 1984-
Notable Scientists and Inventors:
1 physicist
Hannes Alfvén 1908-1995
Olympic Medalists:
1 bronze, 1 silver/bronze, 1 silver/gold
(silver/gold) Hannes Kolehmainen 1912; 1920 10000 m; 5000 m; individual cross country; team cross country; marathon
(silver/bronze) Kaarlo Maaninka (a.k.a. Hannes) 1980 10000 m; 5000 m
(bronze) Hannes Aigner 2012 canoe slalom