tat tasya cadbhutam karma
namadheyam dadus tasmai
vijitasva iti prabho
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear Lord Vidura, when the great sages observed the wonderful prowess of the son of King Prthu, they all agreed to give him the name Vijitasva.