The story
- Proto-Indo-European · derived from*dh₂p-no-
- Middle Irish · derived fromdúan
- Scottish Gaelic · borrowed fromduan
- English todayduan
From Irish and Scottish Gaelic duan, from Middle Irish dúan, from Proto-Indo-European *dh₂p-no- (compare Old Armenian տաւն (tawn, “feast, celebration”), Ancient Greek δαπάνη (dapánē, “cost”), Old Norse tafn (“sacrificial animal”) and Latin damnum (“damage”)), from *deh₂p- (“to sacrifice”).
Etymology from Wiktionary, CC BY-SA 4.0.