Where does “qayınağacı” come from?

qayınağacı (Azerbaijani) comes from Azerbaijani ağac, from Proto-Turkic ïgač — tree.

Ancestry of “qayınağacı”, step by step

qayınağacı traces back through two separate lines of ancestry.

via Azerbaijani ağac

StepLanguageWordMeaning
1Azerbaijaniağactree
2Proto-Turkicïgačtree

via Azerbaijani qayın

StepLanguageWordMeaning
1Azerbaijaniqayınbrother-in-law, specifically, the brother of one's spouse
2Proto-Turkic*kadïŋ—
Every word from Proto-Turkic ïgač →Every word from Azerbaijani ağac →