Caoilainn is a beautiful and unique Irish given name derived from the Irish goddess Cailleach. It translates to "comely", meaning attractive or lovely, and is often associated with winter due to its connection to the goddess who was believed to rule over that season. The name Caoilainn is typically pronounced as /kwee-lin/ in English, reflecting its Irish Gaelic origin while offering a familiar phonetic pronunciation for those unfamiliar with the language. Spelling variations of this name include Caoilfhinn and Caolinn, although Caoilainn remains the most common form. The name Caoilainn is not particularly popular today, which contributes to its rarity and uniqueness among given names in the English-speaking world.
"Caoilainn experienced a peak in popularity with 15 births in 2013, but has generally had between 5 to 9 births each year since 2004, totaling 91 births over this period."