Where does “Slowik” come from?

Slowik (English) comes from Polish Słowik, from Proto-Slavic solvьjь, from Proto-Slavic solvъ, from Proto-Indo-European saluo-.

Ancestry of “Slowik”, step by step

StepLanguageWordMeaning
1PolishSłowiknightingale
2Proto-Slavicsolvьjьnightingale
3Proto-Slavicsolvъyellowish-gray
4Proto-Indo-Europeansaluo-—
Every word from Proto-Indo-European saluo- →Every word from Proto-Slavic solvъ →Every word from Proto-Slavic solvьjь →