Karl is the German and Scandinavian form of Charles and goes back to the Germanic word karl, meaning "free man". It was the name of Charlemagne, Karl der Grosse, and of generations of German and Swedish kings, and it came to America with German immigrants in the 19th century. Karl stood at number 564 in 2000, fell out of the US top 1000 in the mid-2010s and ranks at number 1593 in 2025.