Where does “Psyk” come from?

Psyk (Polish) comes from Upper Sorbian pos, from Proto-Slavic pьsъ, from Proto-Balto-Slavic píśas.

Ancestry of “Psyk”, step by step

Psyk traces back through two separate lines of ancestry.

via Upper Sorbian pos

StepLanguageWordMeaning
1Upper Sorbianposdog
2Proto-Slavicpьsъdog
3Proto-Balto-Slavicpíśas—

via Polish psykać

StepLanguageWordMeaning
1Polishpsykać—
Every word from Proto-Balto-Slavic píśas →Every word from Proto-Slavic pьsъ →Every word from Upper Sorbian pos →