Declension table of ?siddhīśvara

Neuter	Singular	Dual	Plural
Nominative	siddhīśvaram	siddhīśvare	siddhīśvarāṇi
Vocative	siddhīśvara	siddhīśvare	siddhīśvarāṇi
Accusative	siddhīśvaram	siddhīśvare	siddhīśvarāṇi
Instrumental	siddhīśvareṇa	siddhīśvarābhyām	siddhīśvaraiḥ
Dative	siddhīśvarāya	siddhīśvarābhyām	siddhīśvarebhyaḥ
Ablative	siddhīśvarāt	siddhīśvarābhyām	siddhīśvarebhyaḥ
Genitive	siddhīśvarasya	siddhīśvarayoḥ	siddhīśvarāṇām
Locative	siddhīśvare	siddhīśvarayoḥ	siddhīśvareṣu

Compound siddhīśvara -

Adverb -siddhīśvaram -siddhīśvarāt