Declension table of upanāyana

Neuter	Singular	Dual	Plural
Nominative	upanāyanam	upanāyane	upanāyanāni
Vocative	upanāyana	upanāyane	upanāyanāni
Accusative	upanāyanam	upanāyane	upanāyanāni
Instrumental	upanāyanena	upanāyanābhyām	upanāyanaiḥ
Dative	upanāyanāya	upanāyanābhyām	upanāyanebhyaḥ
Ablative	upanāyanāt	upanāyanābhyām	upanāyanebhyaḥ
Genitive	upanāyanasya	upanāyanayoḥ	upanāyanānām
Locative	upanāyane	upanāyanayoḥ	upanāyaneṣu

Compound upanāyana -

Adverb -upanāyanam -upanāyanāt