Where does “Bitner” come from?

Bitner (Polish) comes from German Büttner, from Middle High German bütenære, from Middle High German -ære, from Old High German -āri, from Proto-West Germanic -ārī, from Proto-Germanic -ārijaz, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “Bitner”, step by step

StepLanguageWordMeaning
1GermanBüttnercooper
2Middle High Germanbütenærecooper
3Middle High German-ære—
4Old High German-āriused to form agent nouns
5Proto-West Germanic-ārī-er
6Proto-Germanic-ārijaz-er
7Latin-āriuser
8Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Proto-Germanic -ārijaz →