From Middle English dadd, dadde, of uncertain origin.
Perhaps imitative of a child's first uttered syllables da, da.
Possibly related to Low German detta ("grandfather").
, from Proto-Indo-European *átta, whence Sanskrit तत.
Or, perhaps of Celtic origin, compare Welsh and Breton tad (from Proto-Brythonic *tad), Old Irish data; and possibly related to Russian дя́дя ("uncle") and/or Russian де́душка ("grandfather"), all imitative.
Modern English dictionary
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