Over the past 110 years, 17 593 boys and 51 573 girls have been named Jan. The name Jan ranks 749th in the United States among the most common names for boys. For the first time more than ten times newborns were named Jan in 1915. The peak of popularity of the name Jan came in the 1940s and 1950s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.