Where does “オットー” come from?

オットー (Japanese) comes from German Otto, from Old High German ōt, from Proto-West Germanic aud, from Proto-Germanic audaz — wealth, riches.

Ancestry of “オットー”, step by step

StepLanguageWordMeaning
1GermanOttoOtto
2Old High Germanōtriches; property
3Proto-West Germanicaudwealth, riches
4Proto-Germanicaudazwealth, riches
Every word from Proto-Germanic audaz →Every word from Proto-West Germanic aud →Every word from Old High German ōt →