Aileen is a moderately popular name in the US, but it is more popular in other English-speaking countries such as Ireland, Scotland, and Canada. It has also gained popularity in non-English-speaking countries such as Germany and Austria.

The name Aileen was made famous by the Scottish ballad "Bonnie Aileen," which was written in the early 19th century. Aileen Wuornos was an American serial killer who was executed in 2002 for murdering seven men in Florida. Her story was the subject of the 2003 film "Monster," for which Charlize Theron won an Academy Award for her portrayal of Wuornos.

Aileen Quinn is an American actress and singer who is best known for her role as the title character in the 1982 film adaptation of the musical "Annie." She has also appeared in numerous other films, television shows, and stage productions. Aileen Pringle was an American actress who appeared in over 40 films during the silent era. She was known for her beauty and elegance, and was one of the highest-paid actresses of her time. After retiring from acting, she became a successful interior decorator.