Family name Siddharth (Siddharth 
, 希达 , सिद्धार्थ ) , all over the world, is quite a rare last name. The last name Siddharth is characteristic of United Arab Emirates, where it is a rare surname, Singapore, and Kuwait. Measured by absolute frequency, it is the most numerous in India, China, and Bangladesh. Much more prevalently, Siddharth is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siddharth | Nepal, United States, United Arab Emirates, India, China |
| 希达 | China |
| सिद्धार्थ | India |
Siddhartha, Sidharth, Sìddhàrth, Sìddhárth, Sīddhārth, Сиддхартх, Сиддхартха, Сіддхартх, سيدهارث, সিদ্ধার্থ, சித்தார்த், and สิทธา
| sushil siddharth Hindi writer, critic, and satirist (1958-2018), IN (b. 1958) |
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| ch bharat siddharth researcher |
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| siddharth siddharth researcher (ORCID 0000-0002-1001-8218) |
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| aditi siddharth researcher |
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| nana siddharth researcher |
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| ashok siddharth Indian politician |
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| jay siddharth researcher |
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| jagadeesh siddharth chess player |
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Ray, Mishra, Sawant, Saxena, Sharma, Shinde, Shukla, Kamble, Pandey, Gautam, Jadhav, Thakur, Tiwari, Meshram, Shankar, Agarwal, Agrawal, Chauhan, Bhalerao, Gayakwad, Tripathi, Waghmare, Yadav, Ingle, Verma, Tayde, Rai, Roy, Das, More, Shah, Soni, Garg, Jain, Nair, Mehta, Chaudhary, Singh, Arora, Kadam, Kumar, Patil, Patel, Pawar, Desai, Gupta, Ghosh, Joshi, Sinha, and Srivastava