Kayley has been given to about 8,586 people in the United States since 1880. It was most common in 1999, which makes it a Gen X and millennial name.
Its best year was 1999, when 461 babies were given the name, ranking 548th. The typical living American called Kayley is about 23 years old today. It is relatively most common in New York, where it accounts for 0.00% 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.