SB 4.19.18

tat tasya cādbhutaṁ karma
 vicakṣya paramarṣayaḥ
nāmadheyaṁ dadus tasmai
 vijitāśva iti prabho
Synonyms: 
tat — that; tasya — his; ca — also; adbhutam — wonderful; karma — activity; vicakṣya — after observing; parama-ṛṣayaḥ — the great sages; nāmadheyam — the name; daduḥ — they offered; tasmai — to him; vijita-aśvaḥ — Vijitāśva (he who has won the horse); iti — thus; prabho — my dear Lord Vidura.
Translation: 
My dear Lord Vidura, when the great sages observed the wonderful prowess of the son of King Pṛthu, they all agreed to give him the name Vijitāśva.