Meaning and name origin
Caoilainn \ca(oi)-lainn, caoil(ai)-nn\ as a girl's name is pronounced KAY-lin, KEY-lin. It is of Irish origin, and the meaning of Caoilainn is "slender and white, fair or pure". From "caol fionn". It is anglicized as Kalin or Keelin.
There is 1 masculine form of Caoilainn: Caolan.
Caoilainn is not a popular first name for females and an equally uncommon surname or last name for all people (2000 U.S. Census).
Displayed below is a comparison of the popularity of the girl name Caoilainn and its variant forms. Popular variation forms ranked in the Top 1000/100 are Kayla (#102), Cayla and Calla. (2014 statistics).