Where does “сиротка” come from?

сиротка (Russian) comes from Russian сирота́, from Proto-Slavic sirota, from Proto-Slavic sirъ, from Proto-Indo-European śeiros, from Proto-Indo-European ḱei-ro-.

Ancestry of “сиротка”, step by step

StepLanguageWordMeaning
1Russianсирота́orphan
2Proto-Slavicsirotaorphan
3Proto-Slavicsirъorphaned
4Proto-Indo-Europeanśeiros—
5Proto-Indo-Europeanḱei-ro-—
Every word from Proto-Indo-European ḱei-ro- →Every word from Proto-Indo-European śeiros →Every word from Proto-Slavic sirъ →