Declension table of ?vaivaśya

Neuter	Singular	Dual	Plural
Nominative	vaivaśyam	vaivaśye	vaivaśyāni
Vocative	vaivaśya	vaivaśye	vaivaśyāni
Accusative	vaivaśyam	vaivaśye	vaivaśyāni
Instrumental	vaivaśyena	vaivaśyābhyām	vaivaśyaiḥ
Dative	vaivaśyāya	vaivaśyābhyām	vaivaśyebhyaḥ
Ablative	vaivaśyāt	vaivaśyābhyām	vaivaśyebhyaḥ
Genitive	vaivaśyasya	vaivaśyayoḥ	vaivaśyānām
Locative	vaivaśye	vaivaśyayoḥ	vaivaśyeṣu

Compound vaivaśya -

Adverb -vaivaśyam -vaivaśyāt