Kiley has been given to about 20,272 people in the United States since 1880. It was most common in 2008, which makes it a millennial-parent name.
Its best year was 2008, when 1,098 babies were given the name, ranking 307th. The typical living American called Kiley is about 23 years old today. It is relatively most common in Florida, where it accounts for 0.00% of births.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.