Cailen is an uncommon given name of Irish origin, derived from the ancient Irish word "cailech," meaning "war" or "strife." It has a unique and distinctive sound, making it stand out among more common names. The name Cailen is often associated with strength, courage, and determination due to its roots in Irish warfare and culture. It was typically used as a surname in Ireland before becoming more popular as a given name in recent times.
"Cailen appears to have seen a steady increase in popularity during the late 1990s and early 2000s, peaking around 2007 with 17 births that year. However, its usage has since declined, with only 5 births recorded in both 2015 and 2020."