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"Kothari" means treasurer in Hindi and Rajasthani languages. "Kotha" or "Kothar" words are used for godown, treasure, ware house and so on. And the word Kothari refers to owner or preserver of the same.
Kothari surname is most commonly found among Marwadi (Rajasthani) communities. It is also found among Gujrati and Punjabi communities.
Kothari surname is most common among people following jain religion. It is also found among Hindus. Jyoti Kothari