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The Brahmin castes may be broadly divided into two regional groups: Pancha-Gauda Brahmins from Northern India and considered to be North of Vindhya mountains and Pancha-Dravida Brahmins from South of Vindhya mountains as per the shloka, however this sloka is from Rajatarangini of Kalhana which is composed only in 11th CE.
कर्णाटकाश्च तैलंगा द्राविडा महाराष्ट्रकाः,
गुर्जराश्चेति पञ्चैव द्राविडा विन्ध्यदक्षिणे ||
सारस्वताः कान्यकुब्जा गौडा उत्कलमैथिलाः,
पन्चगौडा इति ख्याता विन्ध्स्योत्तरवासि ||
Translation: Karnataka (Kannada), Telugu (Andhra), Dravida (Tamil and Kerala), Maharashtra and Gujarat are Five Southern (Panch Dravida). Saraswata, Kanyakubja, Gauda, Utkala (Orissa), Maithili are Five Northern (Pancha Gauda). This classification occurs in Rajatarangini of Kalhana and earlier in some inscriptions.
Pancha Gauda Brahmins
Panch Gaur (the five classes of Northern India): (1) Saraswat, (2) Kanyakubja, (3) Maithil Brahmins, (4) Gauda brahmins (including Sanadhyas), and (5)Utkala Brahmins . In addition, for the purpose of giving an account of Northern Brahmins each of the provinces must be considered separately, such as, Kashmir, Nepal, Uttarakhand, Himachal, Kurukshetra, Rajputana, Uttar Pradesh, Ayodhya (Oudh), Gandhara, Punjab, North Western Provinces and Pakistan, Sindh, Central India, Tirhut, Bihar, Orissa, Bengal, Assam, etc. The originate from south of the (now-extinct) Sarasvati River.
Panch Dravida (the five classes of Southern India): 1) Andhra, 2) Dravida (Tamil and Kerala), 3) Karnataka, 4) Maharashtra and Konkon, and 5) Gujarat.
In Maharashtra,Panch dravid Brahmins are classified into five groups: Chitpavan Konkanastha Brahmins, Gaud Saraswat Brahmin, Deshastha Brahmin, Karhade Brahmin, and Devrukhe. As the name indicates, Kokanastha Brahmin are from Konkan area. Gaud Saraswat Brahmins are from Konkan region or they may come from Goa or Karnataka, Deshastha Brahmin are from plains of Maharashtra, Karhade Brahmins are perhaps from Karhatak (an ancient region in India that included present day south Maharashtra and northern Karnataka) and Devrukhe Brahmins are from Devrukh near Ratnagiri.Bagda brahmins
In Andhra Pradesh, Brahmins are broadly classified into 2 groups: Vaidiki Brahmins (meaning educated in vedas and performing religious vocations) and Niyogi (performing only secular vocation). They are further divided into several sub-castes. However, majority of the Brahmins, both Vaidika and Niyogi, perform only secular professions.
Gotras and pravaras
In general, gotra denotes any person who traces descent in an unbroken male line from a common male ancestor. Pāṇini defines gotra for grammatical purposes as ‘ apatyam pautraprabhrti gotram’ , which means ‘the word gotra denotes the progeny (of a sage) beginning with the son’s son. When a person says ‘ I am Kashypasa-gotra’ he means that he traces his descent from the ancient sage Kashyapa by unbroken male descent. According to the Baudhâyanas’rauta-sûtra Viśvāmitra, Jamadagni, Bharadvâja, Gautama, Atri, Vasishtha, Kashyapa and Agastya are 8 sages; the progeny of these eight sages is declared to be gotras. This enumeration of eight primary gotras seems to have been known to Pāṇini. These gotras are not directly connected to Prajapathy or latter brama. The offspring (apatya) of these eight are gotras and others than these are called ‘ gotrâvayava ‘.
The gotras are arranged in groups, e. g. there are according to the Âsvalâyana-srautasûtra four subdivisions of the Vasishtha gana, viz. Upamanyu, Parāshara, Kundina and Vasishtha (other than the first three). Each of these four again has numerous sub-sections, each being called gotra. So the arrangement is first into ganas, then into pakshas, then into individual gotras. The first has survived in the Bhrigu and Āngirasa gana. According to Baudh., the principal eight gotras were divided into pakshas. The pravara of Upamanyu is Vasishtha, Bharadvasu, Indrapramada; the pravara of the Parâshara gotra is Vasishtha, Shâktya, Pârâsharya; the pravara of the Kundina gotra is Vasishtha, Maitrâvaruna, Kaundinya and the pravara of Vasishthas other than these three is simply Vasishtha. It is therefore that some define pravara as the group of sages that distinguishes the founder (lit. the starter) of one gotra from another.
There are two kinds of pravaras, 1) sishya-prasishya-rishi-parampara, and 2) putrparampara. Gotrapravaras can be ekarsheya, dwarsheya, triarsheya, pancharsheya, saptarsheya, and up to 19 rishis. Kashyapasa gotra has at least two distinct pravaras in Andhra Pradesh: one with three sages (triarsheya pravara) and the other with seven sages (saptarsheya pravara). This pravara may be either sishya-prasishya-rishi-parampara or putraparampara. When it is sishya-prasishya-rishi-parampara marriage is not acceptable if half or more than half of the rishis are same in both bride and bridegroom gotras. If it is putraparampara, marriage is totally unacceptable even if one rishi matches.