Jansen is a distinctive boys' name in United States, ranking #2491 in 2006 with 49 recorded births. The name reached its all-time peak in 1997 with 66 births ranking #1560. Since 1996, the popularity has decreased by 12.5%. In 2006, approximately 1 in every 41,941 boys born was named Jansen. FALLING Recent data shows the name is currently falling.