Lennart is a traditional Scandinavian name of Old Norse origin, derived from the elements 'ljonn' meaning lion and 'harthi' meaning strong. It is often associated with Sweden where it has been used historically as well as in contemporary times.
The name Lennart experienced fluctuations in popularity over the course of the century, with peaks in the mid-1920s and early 1930s, and again in the late 1940s. However, it has been less common since the 1950s, with only occasional years seeing more than five births until a slight resurgence in recent decades, with eight births recorded in 2012 and five in 2021. Overall, there were 425 children named Lennart born between 1911 and 2021.