Declension table of ?kaupya

Masculine	Singular	Dual	Plural
Nominative	kaupyaḥ	kaupyau	kaupyāḥ
Vocative	kaupya	kaupyau	kaupyāḥ
Accusative	kaupyam	kaupyau	kaupyān
Instrumental	kaupyena	kaupyābhyām	kaupyaiḥ kaupyebhiḥ
Dative	kaupyāya	kaupyābhyām	kaupyebhyaḥ
Ablative	kaupyāt	kaupyābhyām	kaupyebhyaḥ
Genitive	kaupyasya	kaupyayoḥ	kaupyānām
Locative	kaupye	kaupyayoḥ	kaupyeṣu

Compound kaupya -

Adverb -kaupyam -kaupyāt