The name Kaylin is a modern variation of the Irish name Caitlín, which is the diminutive form of the Irish Gaelic name Cáit. Cáit is derived from the Old Irish name Cátan, which is thought to have originated from the Latin name Catina. The name Catina may have been derived from the Latin word "catus," meaning "pure" or "unsullied."

The earliest recorded use of the name Kaylin dates back to the late 20th century, as it began to gain popularity as a alternative spelling of the more traditional Irish names Caitlin and Cathleen. While the name Kaylin has no direct historical references in ancient texts or religious scriptures, its Irish Gaelic roots can be traced back to the early medieval period.

One of the earliest recorded individuals with the name Kaylin was Kaylin Kathleen Haught, an American actress born in 1981. Kaylin Kathleen Haught is known for her roles in various television series and films, including "The Shield" and "Just Friends."

Kaylin Roberson, born in 1988, is an American professional basketball player who has played for various teams in the WNBA and overseas leagues. She was a standout player at Stanford University and was selected in the 2010 WNBA Draft.

Kaylin Irene Jame, a Canadian singer and songwriter, was born in 1993. She gained recognition for her participation in the seventh season of the reality show "Canadian Idol" in 2008, where she finished as a semi-finalist.

Kaylin Maria Swyers, born in 1985, is an American actress best known for her role as Lily Randall on the Showtime series "Ray Donovan." She has also appeared in various other television shows and films.

Kaylin Lee Richardson, born in 1989, is an American actress and model. She is best known for her role as Lexi in the film "Butter" and her recurring role as Becca Keeler on the television series "Stitchers."

While the name Kaylin is a relatively modern variation, its Irish Gaelic roots and the historical significance of the name Cáit contribute to its rich cultural heritage and potential for meaning and significance for those who bear the name.