Kaylyn has been given to about 12,091 people in the United States since 1880. It was most common in 1994, which makes it a Gen X and millennial name.
Its best year was 1994, when 464 babies were given the name, ranking 536th. The typical living American called Kaylyn is about 25 years old today. It is relatively most common in Arkansas, where it accounts for 0.02% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.