Declension table of ?vayya

Masculine	Singular	Dual	Plural
Nominative	vayyaḥ	vayyau	vayyāḥ
Vocative	vayya	vayyau	vayyāḥ
Accusative	vayyam	vayyau	vayyān
Instrumental	vayyena	vayyābhyām	vayyaiḥ
Dative	vayyāya	vayyābhyām	vayyebhyaḥ
Ablative	vayyāt	vayyābhyām	vayyebhyaḥ
Genitive	vayyasya	vayyayoḥ	vayyānām
Locative	vayye	vayyayoḥ	vayyeṣu

Compound vayya -

Adverb -vayyam -vayyāt