Janson is a distinctive boys' name in United States, ranking #3763 in 2005 with 25 recorded births. This places Janson in the top 28% 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 2005, approximately 1 in every 79,886 boys born was named Janson. FALLING Recent data shows the name is currently falling.