Oleen is a unique and distinctive given name of Irish origin, meaning 'descendant of Allen'. It is also sometimes attributed to Scottish origins, where it may mean 'noble'. The name gained prominence during the Middle Ages in Ireland but has since become quite rare. Oleen was more commonly used as a surname until recent times when some families chose to use it as a given name for their children. Today, Oleen remains an uncommon and intriguing choice for parents looking for an unusual yet meaningful name for their daughter.
"Oleen appears to have been quite popular among parents in the early 20th century, with a notable spike in its usage between 1922 and 1924."