We are building list of Indian and sub-continent Gotra and Surnames, it would be very helpful if you could help us with genuine information.

List of Some popular gotras and Nepali surnames belonging to it:-

Agasti (अगस्ती) : Dhungel

Angira (अंगिरा) : Joshi, Sedai, Saunak, Shahi

Atri (अत्रि) : Adhikari, Arjel/Arjyal, Bam (Raakse Thakuri), Bhatta (Pashupat), Chapagai, Gotame, Khatiwoda, Mishra, Ojha, Wosti

Aatreya (आत्रेय) : Aryal, Bhatta (Duwadi), Devkota, Dawadi, Dulal, Kalikote (Khadka), Paudel, Pokharel (Pani), Rosyara, Sharma, Sigdel, Thapa (Bagale)

Bharadwaaj (भरद्वाज) : Adhikari, Bhatta (Palyal), Chaulagai, Devkota, Jamarkattel, Lohani, Niraula, Panthi, Pandey (Kuleta), Panta, Pokharel (Dudh), Rawat, Shahi, Siwakoti, Sitoula, Subedi, Thami (Adhikari), Thapaliya, Upadhaya, Wagle, [Bhandari (Niraula, Suntakhane)]

Dhananjaya (धनञ्जय) : Basel/ Batsayal, Basnet, Bhusal, Budhathoki (Khulal), Dhamala, Gauripitri/ Gairipippli, Guragai, Humagai, Karki (Khulal), Khadka (Khulal), Kukurkote, Kunwar, Pangeni, Rijal, Thapa, [Bhandari (Bhusal)]

Garg (गर्ग) : Bastola, Bhatta (Lamichhane), Bhetwal, Bhurtel, Chudal, Gajurel, Khetan, Thapa (Lamichhane), Rokaha, Rishal, Shah (Kaskeli Khand)

Gautam (गौतम) : Chanda, Bam (Thakuri), Dangal, Mahat, Pandey (Paleu), Tripathi, Tiwari

Ghrita Kaushik (घृत कौशिक)  : Baral, Karki (Sutar), Khanal, Nepal, Pandit

Kapil (कपिल) : Khati, Daani, Bohora

Kashyap (कश्यप) : Adhikari (Bhadare, Khilchine and Kaubali), Badaal, Bhatta (Kalauni, Mushyal), Bogati, Budhathoki (Sodari), Darji, Gadtaula, Gartaula, Ghimire, Hada, Kathayat, Kumal, Kumbhairana, Pade, Pandey (Badkhora, Badaal, Bhumihar, Simaaldiya), Rayamajhi, Shah (Thakuri), Sahi, Thapa (Godar), Tiwari

Kaudinya (कौण्डिन्य) : Achraya, Baskota, Bhandari (Kaala), Gaagle, Joshi, Khadka, Kharel, Marashini, Neupane, Pakurel, Paneru, Pathak, Parajuli, Sapkota, Satyal, Thapa (Bagale and Gamle), Trital

Kausalya (कौसल्य) : Pathak, Thami (Chhettri)

Kausik (कौशिक) : Bam (Chhatyal Thakuri), Baniya, Bastakoti, Bhandari (Aachhami), Bidari, Dhital, Dhungana, Gaudel, Khadka, Khapatari (Khadka, Bistha, Budhathoki and Basnet), Lamichhane, Luitel, Majhi, Pathak, Phuyal, Pudasaini, Raghubansi, Regmi, Rimal, Sanjel, Shahi (Sijapati), Tiwari, Thami

Kundin (कुण्डिन) : Trital, Banjad/ Banjade

Mandabya (माण्डव्य) : Bajagai, Bajhai, Gyawali, Katuwal, Maskey, Panthi [Bhandari (Bajgain)]

Maudagalya (मौद्गल्य) : Belkadhi, Karki (Mudula), Koirala, Kuinkel, Rume, Simkhada, Timsina/ Timilsina, Upreti

Parasar (परासर) : Dhimal (khas), Karki (Lama) , Kattel, Marhattha

Ravi (रवि) : Shah (Kalyaal Thakuri)

Sankhyayan (सङ्ख्यायन): Pandey (Desh)

Shandilya (शाण्डिल्य): Kafle/ Kaphle, Mahat, Pathak, Prasai, Tiwari

Upamanyu (उपमन्यु): Bartaula, Bhatta (Duwal), Dhakal, Mainali, Pathak

Vishwamitra (विश्वमित्र): Bhatta (Alina, Dumadi, Nirbansi, Rai, and Rayal)

Vatsa (वत्स): Bhatta (Naagar), Dahal, Dayal, Kuwar, Kharaal, Lamsal, Rana, Rupakheti

Vashishta (वशिष्ठ): Bhandari (Thansinghe),  Bhatta (Tapleli), Bhattarai, Chalise, Dawadi, Gaire, Gamnage, Kharel, Mudabhari, Pathak, Raut, Suyal (Garthi), Suyal (Thapa), Thangsine

Gotra of Dashnami Sanyasi:-
Bhaveswa: Puri, Saraswati, Bharati
Adhigata: Tirtha, Ashram
Kashyap: Ban, Aranya
Bhrigu : Giri Parvat. Sagar

What is the Science behind Gotra?
You can read this article below:
https://www.dununu.com/blogs/2760/Why-the-Ancient-Vedic-Rishis-created-the-Gotra-system