Seth has been given to about 166,288 people in the United States since 1880. It was most common in 2000, which makes it a millennial-parent name.
Seth ranks 581st among American boys in 2025, with 505 born that year. Its best year was 2000, when 6,725 babies were given the name, ranking 63rd. The typical living American called Seth is about 29 years old today. It is relatively most common in Indiana, where it accounts for 0.05% 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.