Declension table of ?sira

Masculine	Singular	Dual	Plural
Nominative	siraḥ	sirau	sirāḥ
Vocative	sira	sirau	sirāḥ
Accusative	siram	sirau	sirān
Instrumental	sireṇa	sirābhyām	siraiḥ sirebhiḥ
Dative	sirāya	sirābhyām	sirebhyaḥ
Ablative	sirāt	sirābhyām	sirebhyaḥ
Genitive	sirasya	sirayoḥ	sirāṇām
Locative	sire	sirayoḥ	sireṣu

Compound sira -

Adverb -siram -sirāt