Over the past 110 years, 551 041 girls and 172 boys have been named Janet. The name Janet ranks 49th in the United States among the most common names for girls. For the first time more than ten times newborns were named Janet in 1910. The peak of popularity of the name Janet 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.