The diachronic nature of both vowels is problematic. -e may go back to *-aya resulting from secondary attachment of the 1 sg. pronominal suffix *-ya (Kogan 2009:66).
Also Old Amh., Littman 1943:492.
Amharic
anč̣ət - a kind of hawk with a white breast
(K 1252)
Also Old. Amh. ḥangät, ˀangät, Littmann 1943:484, 492, ḥangät, Ludolf 6.
Amharic
anko - young locust
(AED 1223)
Probably related without augmented -b-.
Amharic
anko - general term for baboon
(AED 1223)
Amharic
ənkoy - a large tree which produces a tasty, yellow fruit (Ximenia americana)
(AED 1227)
Also Old Amh. ˀənkay, Ludolf 61.