An Atreya is a descendant of Atri

Atri

This article is about the sage named Attri. See also the gotra named Atri. For the Italian city, see Atri, AbruzzoIn Hinduism, Attri or Atri is a legendary bard and scholar and was one of 9 Prajapatis, and a son of Brahma, said to be ancestor of some Brahmin, Prajapatis, kshatriya and Vaishya...

, one of the great Hindu

Hindu

Hindu refers to an identity associated with the philosophical, religious and cultural systems that are indigenous to the Indian subcontinent. As used in the Constitution of India, the word "Hindu" is also attributed to all persons professing any Indian religion...

 sages (rishis) whose accomplishments are detailed in the Puranas

Puranas

The Puranas are a genre of important Hindu, Jain and Buddhist religious texts, notably consisting of narratives of the history of the universe from creation to destruction, genealogies of kings, heroes, sages, and demigods, and descriptions of Hindu cosmology, philosophy, and geography.Puranas...

.

The descendents of Atri Rishi use Atreya as their surname just like many other Gotras, or clan names used by the Brahmin

Brahmin

Brahmin Brahman, Brahma and Brahmin.Brahman, Brahmin and Brahma have different meanings. Brahman refers to the Supreme Self...

 community of Hindus in India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 and Nepal

Nepal

Nepal , officially the Federal Democratic Republic of Nepal, is a landlocked sovereign state located in South Asia. It is located in the Himalayas and bordered to the north by the People's Republic of China, and to the south, east, and west by the Republic of India...

. In Northern India, most Atreya Bhramins also prefer to use the Tyagi

Tyagi

Tyagi is a surname of North India and Pakistan. There are both Hindu and Muslim Tyagis. Tyāgī is a sanskrit word meaning the renouncer Once localized to Western Uttar Pradesh, Uttarakhand, Haryana, Rajasthan and Delhi, they are now also found in Sindh and Punjab provinces of Pakistan due to the...

 surname. Many of the Kshatriyas

Rajus

The Raju are a Telugu caste inhabiting Andhra Pradesh, India.-Etymology:Raju is a Telugu variation of the Sanskrit word Raj and Raja meaning king, prince or lord...

 of South India also belong to this gotra.

Original Atreya gotri bramhin have migrated to East Indian state of Orissa which was in the ancient time known as Kalinga, Utkala/Utkal, South Kosal, Kongada, Odra Desha etc. All Oriya-Utkala Brahmin

Utkala Brahmin

Utkala Brahmin also known as Oriya or Orissa Brahmins, is a Varna from the Indian state of Orissa previously known as Utkala Kingdom, Kalinga Kingdom & neighbouring states of Chattisgarh, Andhra Pradesh, West Bengal & Jharkhand.-Background:The Utkala Kingdom was located in the eastern portion of...

s with surname Rath belong to the Atreya gotra in the line of rathātreya (रथात्रेय), a son of Atri and compiler of the Ṛk Veda, 5th Maṇḍala.