Namesakes
Norwegian Kings and Queens:
1 king
King Karl IV (a.k.a. Eugen) 1859-1872 
Notable Actors and Entertainers:
1 actor
Pål Skjønberg (a.k.a. Eugen) 1919-2014
Notable Athletes:
1 soccer
(soccer) Eugene Galekovic (a.k.a. Eugen) 1981-
Notable Scientists and Inventors:
1 inventor
Adolf Gaston Eugen Fick 1852-1937
Notable Writers:
1 author
Eugen Kumičić 1850-1904
Olympic Medalists:
1 bronze, 1 bronze/gold, 1 silver
(bronze/gold) William Petersson (a.k.a. Eugen) 1920 4x100 m relay; long jump
(bronze) Tom Gompf (a.k.a. Eugen) 1964 diving - platform
(silver) Rareș Dumitrescu (a.k.a. Eugen) 2012 fencing
Swedish Kings and Queens:
1 king
King Karl XV (a.k.a. Eugen) 1859-1872