In which countries of Europe were there rulers named Karl? What language did this name come from?

In which countries of Europe were there rulers named Karl? What language did this name come from? What does it mean, when and why did it come into fashion?

The rulers named Karl ruled in France (10 people), Sweden (12 people), Spain, Bohemia and England. The name Karl is Germanic, meaning “fellow, well done.” It became fashionable after the reign of Karl Martell.

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