Where does “воробушек” come from?

воробушек (Russian) comes from Russian воробе́й, from Proto-Slavic *vorbьjь.

Ancestry of “воробушек”, step by step

StepLanguageWordMeaning
1Russianворобе́йsparrow
2Proto-Slavic*vorbьjь—
Every word from Proto-Slavic *vorbьjь →Every word from Russian воробе́й →