PS

*-ī/-ya - my (genitive pronominal suffix, 1 sg.) (Kogan 2009:69)

In most languages *-ya is an allomorph used after long vowels. An exclusion is Ethio-Semitic, where reflexes of *-ya are used in all cases.

Geez
-ya - my (genitive pronominal suffix, 1 sg.) (CDG 625)
Tigre
-ye - my (genitive pronominal suffix, 1 sg.) (WTS 506)
Tigrinya
-äy - my (genitive pronominal suffix, 1 sg.) (Bulakh–Kogan 2013b:101)
Amharic
-e/-ye - my (genitive pronominal suffix, 1 sg.) (AED 1688, Bulakh–Kogan 2013b:101)
-ye is the form used with nouns ending in a vowel.