Where does “taivaanraja” come from?

taivaanraja (Finnish) comes from Finnish raja, from Old East Slavic краи, from Proto-Slavic krajь, from Proto-Slavic krojiti, from Proto-Balto-Slavic krájīˀtei, from Proto-Indo-European kroyh₁-eye-ti, from Proto-Indo-European kroyh₁-, from Proto-Indo-European kroh₁y- — to sift, to separate.

Ancestry of “taivaanraja”, step by step

taivaanraja traces back through two separate lines of ancestry.

via Finnish raja

StepLanguageWordMeaning
1Finnishrajaborder, boundary, limit, line line or frontier area separating political or geographical regions
2Old East Slavicкраиedge; land, country
3Proto-Slavickrajьedge, end
4Proto-Slavickrojitito cut
5Proto-Balto-Slavickrájīˀtei
6Proto-Indo-Europeankroyh₁-eye-ti
7Proto-Indo-Europeankroyh₁-
8Proto-Indo-Europeankroh₁y-
9Proto-Indo-Europeankreh₁y-to sift, to separate

via Finnish taivas

StepLanguageWordMeaning
1Finnishtaivassky; heaven
2Proto-Finnictaivassky
3Proto-Balto-Slavicdeiwasgod
4Proto-Indo-Europeandeywósgod
5Proto-Indo-Europeandyew-to be bright; sky, heaven
Every word from Proto-Indo-European kreh₁y-Every word from Proto-Indo-European kroh₁y-Every word from Proto-Indo-European kroyh₁-