Namesakes
Australian Prime Ministers:
1 prime minister
Julia Gillard (a.k.a. Eileen) 2010-2013 
Fictional Characters from Plays and Musicals:
1 character
Eileen Mulvaney 1917 Eileen
Fictional Characters from Song Titles:
1 character
(character) Eileen 1982 Come On Eileen
Notable Actors and Entertainers:
5 actors
Eileen Heckart 1919-2001
Mary Ure (a.k.a. Eileen) 1933-1975
Eileen Atkins 1934-
Mary McDonnell (a.k.a. Eileen) 1952-
Eileen Davidson 1959-
Notable Musicians:
1 singer
Dolores O'Riordan (a.k.a. Eileen) 1971-2018
Notable Writers:
1 author
Mary Renault (a.k.a. Eileen) 1905-1983
Olympic Medalists:
2 silver, 1 bronze/silver, 1 gold
(silver) Beatrice Armstrong (a.k.a. Eileen) 1920 diving - platform
(gold) Helen Johns (a.k.a. Eileen) 1932 swimming - 4x100 m freestyle relay
(bronze/silver) Eileen Hiscock 1932; 1936 4x100 m relay
(silver) Jean Scrivens (a.k.a. Eileen) 1956 4x100 m relay
Oscar Award Winners:
1 actress
(actress) Eileen Heckart 1973 Butterflies Are Free