Declension table of ?ṛktha

Masculine	Singular	Dual	Plural
Nominative	ṛkthaḥ	ṛkthau	ṛkthāḥ
Vocative	ṛktha	ṛkthau	ṛkthāḥ
Accusative	ṛktham	ṛkthau	ṛkthān
Instrumental	ṛkthena	ṛkthābhyām	ṛkthaiḥ ṛkthebhiḥ
Dative	ṛkthāya	ṛkthābhyām	ṛkthebhyaḥ
Ablative	ṛkthāt	ṛkthābhyām	ṛkthebhyaḥ
Genitive	ṛkthasya	ṛkthayoḥ	ṛkthānām
Locative	ṛkthe	ṛkthayoḥ	ṛktheṣu

Compound ṛktha -

Adverb -ṛktham -ṛkthāt