Declension table of ?hāpya

Masculine	Singular	Dual	Plural
Nominative	hāpyaḥ	hāpyau	hāpyāḥ
Vocative	hāpya	hāpyau	hāpyāḥ
Accusative	hāpyam	hāpyau	hāpyān
Instrumental	hāpyena	hāpyābhyām	hāpyaiḥ hāpyebhiḥ
Dative	hāpyāya	hāpyābhyām	hāpyebhyaḥ
Ablative	hāpyāt	hāpyābhyām	hāpyebhyaḥ
Genitive	hāpyasya	hāpyayoḥ	hāpyānām
Locative	hāpye	hāpyayoḥ	hāpyeṣu

Compound hāpya -

Adverb -hāpyam -hāpyāt