The Mahabharata (Adi Parva, section 65) gives the twelve as Dhata, Mitra, Aryama, Sakra (Indra), Varuna, Amsa, Bhaga, Vivasvan, Pusha, Savita, Tvashta and Vishnu.
Vivasvan: Another name for Surya, the sun god.
Vaivasvata means “son of Vivasvan,” the Sun.
Who was Vaivasvata Manu?Vaivasvata Manu is the solar-line Manu of the present age in Hindu framing: son of Vivasvan (the Sun), flood progenitor, and lawgiver of a manvantara.