Over the past 110 years, 51 573 girls and 17 593 boys have been named Jan. The name Jan ranks 515th in the United States among the most common names for girls. For the first time more than ten times newborns were named Jan in 1921. The peak of popularity of the name Jan came in the 1950s and 1960s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.