Valmiki Ramayana Bala Kanda Sarga 70 Shloka 40

शङ्घणस्य for Samkhana, सुदर्शन: Sudarsana, सुदर्शनात् from Sudarsana, अग्निवर्ण: Agnivarna, अग्निवर्णस्य for AgniVarna, शीघ्रग: Sighraga, शीघ्रगस्य for sighraga, मरु: Maru, सुत: son, मरो: for Maru, प्रशुश्रुक: Prasusruka, प्रशुश्रुकात् from Prasusukra, अम्बरीष: Ambarisha, आसीत् were born.

Sudarsana was the son of Samkhana. His son was Agnivarna. To Agnivarna was born Sighraga and to Sighraga, Maru. To Maru, was born Prasusruka and to Prasrusuka, Ambarisha.