Katelynn has been given to about 30,691 people in the United States since 1880. It was most common in 1998, which makes it a Gen X and millennial name.
Its best year was 1998, when 1,457 babies were given the name, ranking 210th. The typical living American called Katelynn is about 25 years old today. It is relatively most common in Missouri, where it accounts for 0.01% 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.