Akk.-Ugt. isogloss, has no parallel elsewhere in Semitic. If the Akk. and Ugr. terms are related as cognates, the traditional derivation of Akk. išaru from ešēru 'to be straight' (<*yšr) become impossible.
The origin of Akk.-Ugr. *ˁmḳ ‘to be strong’ is uncertain. Hypothetical WS cognates with the meaning “strength” (notably, Hbr. ˁēmäḳ) are quite doubtful (with HALOT 849 and contra Greenfield 1967:89). Somewhat more promising are Tgr. ˁammäḳä ‘to rob, to defraud’ (WTS 456), Amh. ammäḳä ‘to oppress, to rule by force’. There is no transparent semantic link between Akk.-Ugr. *ˁmḳ ‘to be strong’ and *ˁmḳ ‘to be deep’. According to CAD E 161, Akk. emūḳu ‘strength’ is, in its origin, an anatomical term (“arm”), but there is no etymological support for this conjecture. (Kogan 2015:333)