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Atharvan (अथर्वन्,atharvan-; an n-stem with nominative singular अथर्वाatharvā) was a legendary Vedic sage (rishi) of Hinduism who along with Angiras is supposed to have authored ("heard") the Atharvaveda. He is also said to have first instituted the fire-sacrifice or yagna. Sometimes he is also reckoned among the seven seers or Saptarishi. His clan is known as the Atharvanas. Atharvan married Shanti, daughter of Kardama rishi, and had a great sage Dadhichi as a son.
He was referred to as a member of the Bhrigu clan.
According to mundaka upnisad and other texts, he was eldest son & (Manasputra) born from mind of the brahma.
Vedic atharvan is cognate with Avestanāθrauuan / aθaurun, "priest", but the etymology of the term is not yet conclusively established. "Attempts have been made to connect the term with Avestan atar- "fire" (not attested in Vedic); but these have been prompted by what is probably a mistaken assumption of the importance of fire in the ancient Indo-Iranian religion." (Boyce, 1982:16)
Chatterji: The Hymns of Atharvan Zarathushtra (1967) by Jatindra Mohan Chatterji.