Declension table of ?pūrvayāvan

Masculine	Singular	Dual	Plural
Nominative	pūrvayāvā	pūrvayāvāṇau	pūrvayāvāṇaḥ
Vocative	pūrvayāvan	pūrvayāvāṇau	pūrvayāvāṇaḥ
Accusative	pūrvayāvāṇam	pūrvayāvāṇau	pūrvayāvṇaḥ
Instrumental	pūrvayāvṇā	pūrvayāvabhyām	pūrvayāvabhiḥ
Dative	pūrvayāvṇe	pūrvayāvabhyām	pūrvayāvabhyaḥ
Ablative	pūrvayāvṇaḥ	pūrvayāvabhyām	pūrvayāvabhyaḥ
Genitive	pūrvayāvṇaḥ	pūrvayāvṇoḥ	pūrvayāvṇām
Locative	pūrvayāvṇi pūrvayāvaṇi	pūrvayāvṇoḥ	pūrvayāvasu

Compound pūrvayāva -

Adverb -pūrvayāvam