Where does “Митч” come from?

Митч (Russian) comes from English mitch, from English Mitchell — A placename; Any of a number of places in the English-speaking world, named after persons with the surname.

Ancestry of “Митч”, step by step

StepLanguageWordMeaning
1EnglishmitchTo pilfer; filch; steal; To shrink or retire from...
2EnglishMitchellA placename; Any of a number of places in the English-speaking world, named after persons with the surname
Every word from English MitchellEvery word from English mitch