About the name Cailin
Cailin belongs to the English & American tradition. Its roots are documented, even though its precise meaning is not recorded in the standard references — an honest gap we prefer to a confident guess.
In the United States, Cailin first appears in Social Security records in 1968. It climbed to its best-ever rank of #1161 in 1998, and in 2024 14 babies received the name — 3,706 in total since 1880. Those are the official counts, not estimates.