Declension table of ?upayāyin

Neuter	Singular	Dual	Plural
Nominative	upayāyi	upayāyinī	upayāyīni
Vocative	upayāyin upayāyi	upayāyinī	upayāyīni
Accusative	upayāyi	upayāyinī	upayāyīni
Instrumental	upayāyinā	upayāyibhyām	upayāyibhiḥ
Dative	upayāyine	upayāyibhyām	upayāyibhyaḥ
Ablative	upayāyinaḥ	upayāyibhyām	upayāyibhyaḥ
Genitive	upayāyinaḥ	upayāyinoḥ	upayāyinām
Locative	upayāyini	upayāyinoḥ	upayāyiṣu

Compound upayāyi -

Adverb -upayāyi