Declension table of ?parvatya

Masculine	Singular	Dual	Plural
Nominative	parvatyaḥ	parvatyau	parvatyāḥ
Vocative	parvatya	parvatyau	parvatyāḥ
Accusative	parvatyam	parvatyau	parvatyān
Instrumental	parvatyena	parvatyābhyām	parvatyaiḥ parvatyebhiḥ
Dative	parvatyāya	parvatyābhyām	parvatyebhyaḥ
Ablative	parvatyāt	parvatyābhyām	parvatyebhyaḥ
Genitive	parvatyasya	parvatyayoḥ	parvatyānām
Locative	parvatye	parvatyayoḥ	parvatyeṣu

Compound parvatya -

Adverb -parvatyam -parvatyāt