Kielyn is of Irish origin and means "victorious". It is derived from the Irish word 'Caelin', which is a diminutive form of 'Caolán'. The name gained popularity in the United States during the late 20th century, likely due to its unique spelling and sound. It has been used more frequently as a given name for girls since the 1980s.
The name Kielyn has had varying popularity over the past fifteen years, with a notable spike in 2007 and 2009. Since then, its usage has remained relatively steady with an average of about seven births per year until it picked up slightly again in recent years, reaching nine births in 2021 and six births in 2022. In total, there have been ninety-one babies named Kielyn born between 2007 and 2022.