Jansen is a distinctive boys' name in United States, ranking #1980 in 2000 with 52 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 2000, approximately 1 in every 37,768 boys born was named Jansen. FALLING Recent data shows the name is currently falling.