Declension table of ?sumāya

Neuter	Singular	Dual	Plural
Nominative	sumāyam	sumāye	sumāyāni
Vocative	sumāya	sumāye	sumāyāni
Accusative	sumāyam	sumāye	sumāyāni
Instrumental	sumāyena	sumāyābhyām	sumāyaiḥ
Dative	sumāyāya	sumāyābhyām	sumāyebhyaḥ
Ablative	sumāyāt	sumāyābhyām	sumāyebhyaḥ
Genitive	sumāyasya	sumāyayoḥ	sumāyānām
Locative	sumāye	sumāyayoḥ	sumāyeṣu

Compound sumāya -

Adverb -sumāyam -sumāyāt