What does Vivaan mean?
Commonly glossed as 'the first rays of the morning sun' and associated with Surya (the sun). It is a modern Sanskrit-derived name; the popular claim that it is an epithet of Krishna rests on weak sources, so treat that association cautiously.
What does Atharv mean?
From Sanskrit atharvan (अथर्वन्), the name of the Atharvaveda and of the ancient sage traditionally said to be the first priest of fire. Commonly taken to mean 'knowledge' or evokes the Vedic fire-priest.