Akkadian

damtu - figure (of a man) (CAD D 74, CDA 55)

Var. dattu. The word may well be borrowed from Aramaic (hapax legomenon in a late lexical list), cf. Kogan 2015:234.

PNWS
*dmy - to be like, resemble (HALOT 225, Kogan 2015:236)
no obvious cognates, with a possible exception of Tna. dämmäwä - ‘to be handsome, beautifuľ.