Jaiminīya (Talavakāra) Brāhmaṇa 11.44

11.44

atha gautamam
ubhau varṇau samṛddhyai bārhataṃ prastāvena rāthantaramūrdham
gotamo vai rāhūgaṇo'kāmayata sātasani syāmiti
sa etatsāmāpaśyat
tenāstuta
tato vai sa sātasanirabhavat
sātasanayo'sāmeti satramāsate
sātasanaya eva bhavanti
tadye ca ha vai gotamādṛṣayaḥ parāñco ye cārvāñcaste gotamamevarṣimubhaya upāsate
etaṃ hi sa mahimānamapaśyat
ye ca hāsmātparāñcaḥ pitaro bhavanti | ye cārvāñcasta enamubhaya upāsate ya
evaṃ veda
yadu gotamo rāhūgaṇo'paśyattasmādgautamamityākhyāyate

Next, the Gautama [sāman]. Both colors [are used] for success: based on the Bṛhat in its prastāva, based on the Rathantara above. Gotama Rāhūgaṇa desired: 'May I be a winner of gain.' He saw this sāman. With it he praised. Then indeed he became a winner of gain. 'May we be winners of gain'—[so thinking] they sit at the sacrificial session. They indeed become winners of gain. And those ṛṣis who are further back than Gotama and those who are more recent, both revere that very ṛṣi Gotama. For he saw this greatness. Both those fathers who are further back than him and those who are more recent revere him, who knows thus. And because Gotama Rāhūgaṇa saw it, therefore it is called Gautama.