Kathy has been given to about 334,870 people in the United States since 1880. It was most common in 1958, which makes it a midcentury name.
Its best year was 1958, when 23,983 babies were given the name, ranking 14th. The typical living American called Kathy is about 67 years old today. It is relatively most common in Pennsylvania, 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.