From Proto-Italic *daps, from Proto-Indo-European *déh₂ps (“portion, sacrificial meal”).
Cognate with Ancient Greek δαπάνη (dapánē, “expenditure”), δάπτω (dáptō, “I devour”), Old Armenian տաւն (tawn, “feast”), Old Norse tafn (“sacrifice”). Akin to damnum (“loss, expense”).