Declension table of ?kupāyu

Masculine	Singular	Dual	Plural
Nominative	kupāyuḥ	kupāyū	kupāyavaḥ
Vocative	kupāyo	kupāyū	kupāyavaḥ
Accusative	kupāyum	kupāyū	kupāyūn
Instrumental	kupāyunā	kupāyubhyām	kupāyubhiḥ
Dative	kupāyave	kupāyubhyām	kupāyubhyaḥ
Ablative	kupāyoḥ	kupāyubhyām	kupāyubhyaḥ
Genitive	kupāyoḥ	kupāyvoḥ	kupāyūnām
Locative	kupāyau	kupāyvoḥ	kupāyuṣu

Compound kupāyu -

Adverb -kupāyu