The name Ileana has its origins in the Romanian language and culture. It is a feminine form of the name Ilie, which is derived from the Greek name Elias or Helios, meaning "sun". The name likely emerged during the Middle Ages in the region that is now modern-day Romania.

One of the earliest recorded instances of the name Ileana can be found in the 15th century, when it was borne by Ileana Despina, a Princess of Wallachia and the daughter of Vlad III Dracula, known as Vlad the Impaler. She lived from around 1470 to 1508.

Another notable historical figure with this name was Ileana of Romania, a Princess of Romania and Archduchess of Austria-Este. She was born in 1909 and lived until 1991. Ileana was known for her philanthropic work and her devotion to the Orthodox Christian faith.

In the 20th century, Ileana Cosânzeana was a prominent Romanian actress and singer, known for her roles in numerous films and operettas. She was born in 1888 and died in 1965.

Ileana Cotrubaș, born in 1939, is a celebrated Romanian opera singer who has performed on some of the world's most prestigious stages, including the Metropolitan Opera in New York City.

Ileana Mălăncioiu, born in 1939, is a respected Romanian poet and essayist, known for her contributions to contemporary Romanian literature.

While the name Ileana has its roots in the Romanian language and culture, it has also been used in other parts of the world, particularly in areas with Romanian communities or influences. However, its historical significance and earliest recorded use can be traced back to the region that is now modern-day Romania.