Diminutive forms include Ilonka and Ilike.
Ilona is a common name in Finland, where it is considered to refer to the Finnish word ilo ("joy") and ilona literally means "as a joy [to someone]". It is also common in Lithuania, Poland (formerly in crown union with Hungary) and in France.
The name Ilona may refer to:
- Archduchess Ilona of Austria (born 1927)
- Ilona Andrews, joint pen name of American novelist duo Ilona (Russian born) and Andrew Gordon
- Ilona Csáková (born 1970), Czech pop singer
- Ilona Eibenschütz (1872–1967), Hungarian pianist
- Ilona Elek (1907–1988), Hungarian 2× Olympic champion saber fencer
- Ilona Fehér (1901–1988), Hungarian violinist and teacher
- Ilona Gusenbauer (born 1947), Austrian high jumper
- Ilona Hlaváčková (born 1977), Czech swimmer
- Ilona Jokinen (born 1981), Finnish opera singer
- Ilona Massey (1910–1974), Hungarian actress
- Ilona Mitrecey (born 1993), French singer
- Ilona Novák (born 1925), Hungarian swimmer
- Ilona Ostrowska, Polish actress
- Ilona Senderek (born 1988), Polish figure skater
- Ilona Kesidou (born 1989) interior designer, industrial designer, Greece best upcoming industrial designer, Georgia-born live in Greece
- Ilona Slupianek (born 1956), retired world champion shot putter who competed for East Germany
- Ilona Staller (born 1951) aka Cicciolina, Hungarian-born Italian porn-star, sometime politician, and singer
- Ilona Štěpánová-Kurzová (1899–1975), Czech concert pianist and piano teacher
- Ilona Szilágyi, second wife of Vlad III the Impaler
- Ilona Tözser, Hungarian sprint canoer
- Ilona Zrínyi (1643–1703), Croatian countess noted for defending Palanok Castle for three years
- Ilona (singer), Colombian singer-songwriter
- Ilona Hanne (born 1975) Journalist and editor for New Zealand-based company, NZME.
- Jarvis, Stan (2008). Discovering First Names. Osprey Publishing. p. 58. ISBN 978-0-7478-0383-6.
- There are 25,000 women named Ilona in the Finnish Population Register: Name service
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