Declension table of ?ṛchivas

Masculine	Singular	Dual	Plural
Nominative	ṛchivān	ṛchivāṃsau	ṛchivāṃsaḥ
Vocative	ṛchivan	ṛchivāṃsau	ṛchivāṃsaḥ
Accusative	ṛchivāṃsam	ṛchivāṃsau	ṛchuṣaḥ
Instrumental	ṛchuṣā	ṛchivadbhyām	ṛchivadbhiḥ
Dative	ṛchuṣe	ṛchivadbhyām	ṛchivadbhyaḥ
Ablative	ṛchuṣaḥ	ṛchivadbhyām	ṛchivadbhyaḥ
Genitive	ṛchuṣaḥ	ṛchuṣoḥ	ṛchuṣām
Locative	ṛchuṣi	ṛchuṣoḥ	ṛchivatsu

Compound ṛchivat -

Adverb -ṛchivas