Where does “wnusio” come from?

wnusio (Polish) comes from Polish Wnuk, from Old Polish wnuk, from Proto-Slavic vъnukъ — grandson.

Ancestry of “wnusio”, step by step

StepLanguageWordMeaning
1PolishWnukgrandson
2Old Polishwnuk—
3Proto-Slavicvъnukъgrandson
Every word from Proto-Slavic vъnukъ →Every word from Old Polish wnuk →Every word from Polish Wnuk →