KAṬHA UPANISHAD · 1.1.16

तमब्रवीत् प्रीयमाणो महात्मा
वरं तवेहाद्य ददामि भूयः ।
तवैव नाम्ना भविताऽयमग्निः
सृङ्कां चेमामनेकरूपां गृहाण ॥ १६॥

tamabravīt prīyamāṇo mahātmā
varaṃ tavehādya dadāmi bhūyaḥ ।
tavaiva nāmnā bhavitā’yamagniḥ
sṛṅkāṃ cemāmanekarūpāṃ gṛhāṇa ॥ 16॥

Yea; the Great Soul was gratified and said to him, “Yet a farther boon today I give thee; for even by thy name shall this Fire be called; this necklace also take unto thee, a necklace of many figures.