Declension table of ?ṛkvan

Masculine	Singular	Dual	Plural
Nominative	ṛkvā	ṛkvāṇau	ṛkvāṇaḥ
Vocative	ṛkvan	ṛkvāṇau	ṛkvāṇaḥ
Accusative	ṛkvāṇam	ṛkvāṇau	ṛkvaṇaḥ
Instrumental	ṛkvaṇā	ṛkvabhyām	ṛkvabhiḥ
Dative	ṛkvaṇe	ṛkvabhyām	ṛkvabhyaḥ
Ablative	ṛkvaṇaḥ	ṛkvabhyām	ṛkvabhyaḥ
Genitive	ṛkvaṇaḥ	ṛkvaṇoḥ	ṛkvaṇām
Locative	ṛkvaṇi	ṛkvaṇoḥ	ṛkvasu

Compound ṛkva -

Adverb -ṛkvam