Cian is an Irish name that means "ancient" or "enduring". It appears in the earliest Irish legends, where Cian is the father of the hero Lugh, and it has been a top 20 name in Ireland for decades; the anglicized spelling Kian is more common in the United States. Cian stood at number 1668 in 2000, peaked at number 1039 in 2007 and ranks number 1310 in 2025.