Where does “Karlo” come from?

Karlo (Esperanto) comes from Proto-Germanic karilaz, from Proto-Germanic karaz, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

Ancestry of “Karlo”, step by step

StepLanguageWordMeaning
1Proto-Germanickarilazfree man, franklin; little man, young man
2Proto-Germanickaraz—
3Proto-Indo-Europeanǵerh₂-to grow old, to mature
Every word from Proto-Indo-European ǵerh₂- →Every word from Proto-Germanic karaz →Every word from Proto-Germanic karilaz →