Where does “сивъ” come from?

сивъ (Old East Slavic) comes from Proto-Slavic sivъ, from Proto-Balto-Slavic śī́ˀwas, from Proto-Indo-European (s)ḱih₃-wó-s, from Proto-Indo-European (s)ḱeh₃- — darkness, shadow.

Ancestry of “сивъ”, step by step

StepLanguageWordMeaning
1Proto-Slavicsivъgrey; hoary, grey-haired, aging
2Proto-Balto-Slavicśī́ˀwasgrey
3Proto-Indo-European(s)ḱih₃-wó-s
4Proto-Indo-European(s)ḱeh₃-darkness, shadow

Words derived from “сивъ

Every word from Proto-Indo-European (s)ḱeh₃-Every word from Proto-Indo-European (s)ḱih₃-wó-sEvery word from Proto-Balto-Slavic śī́ˀwas