Declension table of ?rīvya

Masculine	Singular	Dual	Plural
Nominative	rīvyaḥ	rīvyau	rīvyāḥ
Vocative	rīvya	rīvyau	rīvyāḥ
Accusative	rīvyam	rīvyau	rīvyān
Instrumental	rīvyeṇa	rīvyābhyām	rīvyaiḥ rīvyebhiḥ
Dative	rīvyāya	rīvyābhyām	rīvyebhyaḥ
Ablative	rīvyāt	rīvyābhyām	rīvyebhyaḥ
Genitive	rīvyasya	rīvyayoḥ	rīvyāṇām
Locative	rīvye	rīvyayoḥ	rīvyeṣu

Compound rīvya -

Adverb -rīvyam -rīvyāt