Jo has been given to about 180,911 people in the United States since 1880. It was most common in 1954, which makes it a midcentury name.
Its best year was 1954, when 8,077 babies were given the name, ranking 53rd. The typical living American called Jo is about 73 years old today. It is relatively most common in California, 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.