Declension table of ?sāṅkṛtīputra

Masculine	Singular	Dual	Plural
Nominative	sāṅkṛtīputraḥ	sāṅkṛtīputrau	sāṅkṛtīputrāḥ
Vocative	sāṅkṛtīputra	sāṅkṛtīputrau	sāṅkṛtīputrāḥ
Accusative	sāṅkṛtīputram	sāṅkṛtīputrau	sāṅkṛtīputrān
Instrumental	sāṅkṛtīputreṇa	sāṅkṛtīputrābhyām	sāṅkṛtīputraiḥ sāṅkṛtīputrebhiḥ
Dative	sāṅkṛtīputrāya	sāṅkṛtīputrābhyām	sāṅkṛtīputrebhyaḥ
Ablative	sāṅkṛtīputrāt	sāṅkṛtīputrābhyām	sāṅkṛtīputrebhyaḥ
Genitive	sāṅkṛtīputrasya	sāṅkṛtīputrayoḥ	sāṅkṛtīputrāṇām
Locative	sāṅkṛtīputre	sāṅkṛtīputrayoḥ	sāṅkṛtīputreṣu

Compound sāṅkṛtīputra -

Adverb -sāṅkṛtīputram -sāṅkṛtīputrāt