Śatapatha Brāhmaṇa ("of a hundred paths") 3.6.2.24

3.6.2.24

te vai dvināmāno bhavanti | eta u haivaitaddadhrire na vā ebhirnāmabhirarātsma yeṣāṃ naḥ somamapāhārṣurhanti dvitīyāni nāmāni karavāmahā iti te dvitīyāni nāmānyakurvata tairarādhnuvanyānapahṛtasomapīthāntsato 'tha yajña ābhajaṃstasmāddvināmānastasmādbrāhmaṇo 'nṛdhyamāne dvitīyaṃ nāma kurvīta rādhnoti haiva ya evaṃ vidvāndvitīyaṃ nāma kurute

They have two names; for, in truth, they themselves insisted thereon, saying, 'We have not prospered with these names, since Soma has been taken away from us; well, then, let us take each a second name!' They took each a second name, and therewith prospered, inasmuch as they from whom the Soma-draught had been taken had a share in the sacrifice assigned to them; hence they have two names. Wherefore let a Brahman, if he prosper not, take a second name, for verily he prospers, whosoever, knowing this, takes a second name.