Shiva Purana

siva.sh/siva-purana/rudra-samhita/165/34

उत्सवस्सुमहानासीत्तस्मिञ्जाते द्विजोत्तम ।। नाम चक्रे पिता तस्य शंख चूडेति सद्दिने ।।३४।।

sanskrit

O excellent brahmin, when the boy was born there was great jubilation. On an auspicious day the father named him “Śaṅkhacūḍa."

english translation

utsavassumahAnAsIttasmiJjAte dvijottama || nAma cakre pitA tasya zaMkha cUDeti saddine ||34||

hk transliteration by Sanscript