Jansen is a distinctive boys' name in United States, ranking #1920 in 2001 with 57 recorded births. This places Jansen in the top 16% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1997 with 66 births ranking #1560. In 2001, approximately 1 in every 34,085 boys born was named Jansen. FALLING Recent data shows the name is currently falling.