Declension table of ?vaya

Masculine	Singular	Dual	Plural
Nominative	vayaḥ	vayau	vayāḥ
Vocative	vaya	vayau	vayāḥ
Accusative	vayam	vayau	vayān
Instrumental	vayena	vayābhyām	vayaiḥ vayebhiḥ
Dative	vayāya	vayābhyām	vayebhyaḥ
Ablative	vayāt	vayābhyām	vayebhyaḥ
Genitive	vayasya	vayayoḥ	vayānām
Locative	vaye	vayayoḥ	vayeṣu

Compound vaya -

Adverb -vayam -vayāt