Caitlin has been given to about 112,426 people in the United States since 1880. It was most common in 1988, which makes it a Gen X and millennial name.
Its best year was 1988, when 7,274 babies were given the name, ranking 44th. The typical living American called Caitlin is about 33 years old today. It is relatively most common in Illinois, 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.