Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 14
Sanskrit:
तस्यात्मयोनिरकृत बुध इत्यभिधां नृप ।बुद्ध्या गम्भीरया येन पुत्रेणापोडुराण्मुदम् ॥ १४ ॥
ITRANS:
tasyātma-yonir akṛtabudha ity abhidhāṁ nṛpabuddhyā gambhīrayā yenaputreṇāpoḍurāṇ mudam
Translation:
O Mahārāja Parīkṣit, when Lord Brahmā saw that the child was deeply intelligent, he gave the child the name Budha. The moon-god, the ruler of the stars, enjoyed great jubilation because of this son.