Where does “Sojka” come from?

Sojka (English) comes from Polish Sójka, from Old Polish sojka, from Proto-Slavic sojьka, from Proto-Slavic -ъka, from Proto-Indo-European -kos — Creates deadjectival and desubstantival...

Ancestry of “Sojka”, step by step

StepLanguageWordMeaning
1PolishSójkaEurasian jay
2Old Polishsojka—
3Proto-SlavicsojьkaAlternative form of *soja
4Proto-Slavic-ъkaDenominal, forms diminutives; Deadjectival,...
5Proto-Indo-European-kosCreates deadjectival and desubstantival...
Every word from Proto-Indo-European -kos →Every word from Proto-Slavic -ъka →Every word from Proto-Slavic sojьka →