Akkadian

maḫāˀu - (kinship term) (CAD M₁ 85, AHw. 582)

Fem. maḫātu. ‘Onkel? Tante?’ (AHw. 582); ‘possibly elder brother or sister’ (CAD M₁ 85).
Cf. Gez. ˀəmməḥew ‘grandfather’ and related terms of EthS. (Kogan 2014: 94).