From Wiktionary, the free dictionary
*ʔayy-
Used to form questions: which , what , when , where , how , etc.
Declension of *ʔayy-
singular
dual
plural
m
f
m
f
m
f
nominative
*ʔayyum
*ʔayyatum
*ʔayyāna
*ʔayyatāna
*ʔayyūna
*ʔayyātum
accusative
*ʔayyam
*ʔayyatam
*ʔayyayna
*ʔayyatayna
*ʔayyīna
*ʔayyātim
genitive
*ʔayyim
*ʔayyatim
East Semitic:
Akkadian: 𒀀𒀀𒌑𒌝 ( ayyum , “ which ” )
West Semitic:
Central Semitic:
Arabic: أَيّ ( ʔayy , “ which ” )
Northwest Semitic:
Aramaic:
Jewish Babylonian Aramaic: אַיְנָא ( ʾaynā , “ who, which, what ” )
Classical Syriac: ܐܰܝܢܳܐ ( ʾaynā , “ who, which, what ” )
Canaanite:
Hebrew: אֵי ( e, ʾê , “ where ” ) , אַיֵּה ( 'ayé, ʾayyê , “ where ” )
Hebrew: אֵיזֶה ( 'éze, ʾếzê , “ which, what ” ) , אֵיפֹה ( efo, ʾêp̄ô , “ where ” ) , הֵיכָן ( hékhan, hêḵān , “ where ” ) , אֵימָתַי ( 'ematáy, ʾêmāṯay , “ when ” ) , כֵּיצַד ( ketsád, kêṣaḏ , “ how ” ) , אֵיך ( ékh, ʾêḵ , “ how ” )
Ugaritic: 𐎛𐎊 ( ỉy /ʾē/ ) / 𐎛 ( ỉ /ʾēyy/ , “ where ” )
Old South Arabian:
Minaean: 𐩱𐩺 ( ʾy , “ whichever ” )
Qatabanian: 𐩱𐩺 ( ʾy , “ whichever ” )
Sabaean: 𐩱𐩺 ( ʾy , “ which ” )
Ethiopian Semitic:
Ge'ez: አይ ( ʾäy , “ which, what ” )
Tigre: አዪ ( ʾäyi , “ which ” )
Tigrinya: -አይ ( -äy ) ( suffixed to interrogatives )
Eran Cohen (2019 ) “The Interrogative Element *ʾayy - in Semitic”, in Zeitschrift der Deutschen Morgenländischen Gesellschaft [1] , volume 169 , number 2, pages 327-342