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.