Declension table of ?vasavya

Neuter	Singular	Dual	Plural
Nominative	vasavyam	vasavye	vasavyāni
Vocative	vasavya	vasavye	vasavyāni
Accusative	vasavyam	vasavye	vasavyāni
Instrumental	vasavyena	vasavyābhyām	vasavyaiḥ
Dative	vasavyāya	vasavyābhyām	vasavyebhyaḥ
Ablative	vasavyāt	vasavyābhyām	vasavyebhyaḥ
Genitive	vasavyasya	vasavyayoḥ	vasavyānām
Locative	vasavye	vasavyayoḥ	vasavyeṣu

Compound vasavya -

Adverb -vasavyam -vasavyāt