Elleen is of French origin, derived from the Occitan name Alenor, which means 'noble and bright'. The name gained popularity in England during the Middle Ages due to its use among the Norman nobility.
"Despite peaking twice at 11 births each in 1920 and 1922, the name Elleen has seen a steady decline since the 1950s with only five years recording more than five births between 1954 and 2020. The most recent peak was in 2015 with seven births."