To be compared to Akk. danānu 'to be strong' (see the list of ES cognates under that entry).
It is hard to say whether this and other Neo-Ethiopian terms for ‘border, limit’ belong to PS *dawr, in view of the semantic difference. The reduplicated expression bä—dardar ‘all along’ (EDG 217) is noteworthy.
Probably related following Leslau 1956: 247 and EDG 218. See also zəndərä ‘this year’ (EDG 218).