Sanjuan has been given to about 139 people in the United States since 1880. It was most common in 1974, which makes it a boomer-era name.
Its best year was 1974, when 11 babies were given the name, ranking 3287th. The typical living American called Sanjuan is about 47 years old today.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.