Declension table of jāhnava

Masculine	Singular	Dual	Plural
Nominative	jāhnavaḥ	jāhnavau	jāhnavāḥ
Vocative	jāhnava	jāhnavau	jāhnavāḥ
Accusative	jāhnavam	jāhnavau	jāhnavān
Instrumental	jāhnavena	jāhnavābhyām	jāhnavaiḥ jāhnavebhiḥ
Dative	jāhnavāya	jāhnavābhyām	jāhnavebhyaḥ
Ablative	jāhnavāt	jāhnavābhyām	jāhnavebhyaḥ
Genitive	jāhnavasya	jāhnavayoḥ	jāhnavānām
Locative	jāhnave	jāhnavayoḥ	jāhnaveṣu

Compound jāhnava -

Adverb -jāhnavam -jāhnavāt