Gaylen is an uncommon given name of unclear origin and meaning. It was first used in the United States during the mid-20th century, where it gained a brief period of popularity before fading into obscurity. The name is believed to have been created as a unisex name, but it is more commonly associated with males.
"The name Gaylen saw its peak popularity between 1947 and 1952, with a high of 18 births in 1948 and 1951. However, it became less common after the 1960s, with only sporadic years seeing more than five births until the 1990s."