Declension table of ?vayiyu

Neuter	Singular	Dual	Plural
Nominative	vayiyu	vayiyunī	vayiyūni
Vocative	vayiyu	vayiyunī	vayiyūni
Accusative	vayiyu	vayiyunī	vayiyūni
Instrumental	vayiyunā	vayiyubhyām	vayiyubhiḥ
Dative	vayiyune	vayiyubhyām	vayiyubhyaḥ
Ablative	vayiyunaḥ	vayiyubhyām	vayiyubhyaḥ
Genitive	vayiyunaḥ	vayiyunoḥ	vayiyūnām
Locative	vayiyuni	vayiyunoḥ	vayiyuṣu

Compound vayiyu -

Adverb -vayiyu