Declension table of ?sayava

Neuter	Singular	Dual	Plural
Nominative	sayavam	sayave	sayavāni
Vocative	sayava	sayave	sayavāni
Accusative	sayavam	sayave	sayavāni
Instrumental	sayavena	sayavābhyām	sayavaiḥ
Dative	sayavāya	sayavābhyām	sayavebhyaḥ
Ablative	sayavāt	sayavābhyām	sayavebhyaḥ
Genitive	sayavasya	sayavayoḥ	sayavānām
Locative	sayave	sayavayoḥ	sayaveṣu

Compound sayava -

Adverb -sayavam -sayavāt