Atreya
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An Atreya (आत्रेय) is a descendant of Atri, one of the great Hindu sages (rishis) whose accomplishments are detailed in the Puranas.
The descendents of Atri Rishi use Atreya as their surname just like many other Gotras, or clan names used by the Brahmin community of Hindus in India and Nepal. In Northern India, most Atreya Bhramins also prefer to use the Tyagi surname.
Original Atreya gotri bramhin have migrated to east India. All Bramhans with surname ({Rath))have only Atreya gotra.