Namesakes
Norwegian Kings and Queens:
1 king
King Karl IV (middle name Eugen) 1859-1872 
Notable Actors and Entertainers:
1 actor
Pål Skjønberg (middle name 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 (middle name Eugen) 1920 4x100 m relay; long jump
(bronze) Tom Gompf (middle name Eugen) 1964 diving - platform
(silver) Rareș Dumitrescu (middle name Eugen) 2012 fencing
Other Royalty:
2 princes
Eugen of Sweden 1865-1947 Sweden
Bertil of Sweden (middle name Eugen) 1912-1997 Sweden
Swedish Kings and Queens:
1 king
King Karl XV (middle name Eugen) 1859-1872