Lennart is a distinctive boys' name in United States, ranking #13215 in 2006 with 5 recorded births. This places Lennart in the bottom 6% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2012 with 8 births ranking #9372. In 2006, approximately 1 in every 411,024 boys born was named Lennart. STABLE Recent data shows the name is currently stable.