Janson is a distinctive boys' name in United States, ranking #3864 in 2009 with 27 recorded births. This places Janson in the top 27% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2016 with 35 births ranking #3256. In 2009, approximately 1 in every 73,456 boys born was named Janson. FALLING Recent data shows the name is currently falling.