Where does “rzeczka” come from?

rzeczka (Polish) comes from Polish -ka, from Old Polish -ka, from Proto-Slavic -ъka, from Proto-Indo-European -kos — Creates deadjectival and desubstantival...

Ancestry of “rzeczka”, step by step

Step	Language	Word	Meaning
1	Polish	-ka	feminine noun suffix; diminutive noun suffix;...
2	Old Polish	-ka	feminine noun suffix
3	Proto-Slavic	-ъka	Denominal, forms diminutives; Deadjectival,...
4	Proto-Indo-European	-kos	Creates deadjectival and desubstantival...

Every word from Proto-Indo-European -kos →Every word from Polish -ka →Every word from Proto-Slavic -ъka →