Namesakes
Eurovision Song Contest Winners:
2 winners
Lenny Kuhr 1969 Netherlands 
Helena Paparizou 2005 Greece
Fictional Characters from Plays and Musicals:
1 character
Helena 1595 A Midsummer Night's Dream
Fictional Characters from Song Titles:
3 characters
(character) Helena 1999 Helena
(character) Helena 2004 Helena
(character) Helena 2011 Helena Beat
Harry Potter Characters:
1 character
Helena "The Grey Lady" Ravenclaw
Hurricanes and Tropical Storms:
1 storm
Storm Helena 1963
Notable Activists and Revolutionaries:
1 activist
(activist) Sheila Kitzinger (a.k.a. Helena) 1929-2015
Notable Actors and Entertainers:
2 actors
Helena Bonham Carter 1966-
Nicolette van Dam (a.k.a. Helena) 1984-
Notable Artists:
1 painter
Maria Helena Vieira da Silva 1908-1992
Notable Athletes:
1 gymnastics, 1 soccer, 1 tennis
(tennis) Helena Suková 1965-
(soccer) Daphne Koster (a.k.a. Helena) 1981-
(gymnastics) Dominique Moceanu (a.k.a. Helena) 1981-
Notable Businesspeople:
1 businessperson
Helena Rubinstein 1872-1965
Notable Musicians:
2 singers
Lenny Kuhr 1950-
Helena Paparizou 1982-
Notable Scientists and Inventors:
1 astronomer
Cecilia Payne-Gaposchkin (a.k.a. Helena) 1900-1979
Olympic Medalists:
4 bronze, 1 gold, 1 silver
(bronze) Gladys Carson (a.k.a. Helena) 1924 swimming
(bronze) Helena Fibingerová 1976 shot put
(silver) Helena Suková 1988; 1996 tennis
(gold) Dominique Moceanu (a.k.a. Helena) 1996 artistic gymnastics
(bronze) Marja-Helena Pälvilä 1998 ice hockey
(bronze) Helena Fromm 2012 taekwondo
Other Notables:
1 person
Helena Blavatsky 1831-1891 mysticism
Other Royalty:
1 princess, 1 queen
Wilhelmina of the Netherlands (a.k.a. Helena) 1890-1948 Netherlands
Élisabeth, Duchess of Brabant (a.k.a. Helena) 2001- Belgium
Saints:
3 saints, 2 blessed
Saint Helena ?-330
Saint Helena ?-418
Saint Helena ?-750
Blessed Helena Stollenwerk 1852-1900
Blessed Maria Restituta Kafka (a.k.a. Helena) 1894-1943
Shakespearian Characters:
2 characters
Helena A Midsummer Night's Dream
Helena All's Well That Ends Well