Akkadian

dāru - generation (AHw. 164, CAD D 115)

According to a broad concensus (AHw 164, CAD D 115, Streck 2000: 88), an early WS borrowing comparable to Hebrew dōr and its cognates listed here.

PS
*dawr-/*dawar- - period, cycle (DRS 240, Marassini 1971: 48, Fronzaroli 1965: 143, 148, EDA II)

The – apparently iconic (descriptive) – reduplication *dār- dār- (or *dār- dawr-), attested in both Akkadian and early NWS (Ugaritic, Hebrew, Aramaic), may go back to PS.