Where does “taivasosa” come from?

taivasosa (Finnish) comes from Finnish taivas, from Proto-Finnic taivas, from Proto-Balto-Slavic deiwas, from Proto-Indo-European deywós, from Proto-Indo-European dyew- — to be bright; sky, heaven.

Ancestry of “taivasosa”, step by step

taivasosa traces back through two separate lines of ancestry.

via Finnish taivas

StepLanguageWordMeaning
1Finnishtaivassky; heaven
2Proto-Finnictaivassky
3Proto-Balto-Slavicdeiwasgod
4Proto-Indo-Europeandeywósgod
5Proto-Indo-Europeandyew-to be bright; sky, heaven

via Finnish osa

StepLanguageWordMeaning
1Finnishosapart; piece; proportion, section
2Proto-Finnicosapart
3Proto-Uraliconćapart, share (of meat?)
Every word from Proto-Indo-European dyew- →Every word from Proto-Indo-European deywós →Every word from Proto-Balto-Slavic deiwas →