Katelyn has been given to about 134,206 people in the United States since 1880. It was most common in 1993, which makes it a Gen X and millennial name.
Its best year was 1993, when 5,975 babies were given the name, ranking 54th. The typical living American called Katelyn is about 27 years old today. It is relatively most common in Utah, 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.