Meaning: Its source is an English expression meaning "Happy."

Popularity: The name Kayleen ranked 2612th in popularity for females of all ages in a sample of the 1990 US Census.

Though this name appears on the 1990 U.S. Census lists, it is used by only a small percentage of the general population.

Narrative: Though the male Kay probably comes from the Latin name Gaius, meaning ''happy,'' this female version more likely started as a nickname for names beginning with the letter K, especially Katherine, Karen and Kathryn.