Katy has been given to about 20,957 people in the United States since 1880. It was most common in 1987, which makes it a Gen X and millennial name.
Its best year was 1987, when 674 babies were given the name, ranking 351st. The typical living American called Katy is about 39 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, 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.