Declension table of ?sumitrya

Masculine	Singular	Dual	Plural
Nominative	sumitryaḥ	sumitryau	sumitryāḥ
Vocative	sumitrya	sumitryau	sumitryāḥ
Accusative	sumitryam	sumitryau	sumitryān
Instrumental	sumitryeṇa	sumitryābhyām	sumitryaiḥ sumitryebhiḥ
Dative	sumitryāya	sumitryābhyām	sumitryebhyaḥ
Ablative	sumitryāt	sumitryābhyām	sumitryebhyaḥ
Genitive	sumitryasya	sumitryayoḥ	sumitryāṇām
Locative	sumitrye	sumitryayoḥ	sumitryeṣu

Compound sumitrya -

Adverb -sumitryam -sumitryāt