Surname सिद्धार्थ (Siddharth 
, Siddhartha , Siddarth 
) , in all the world, is quite a common family name. The family name सिद्धार्थ is habitual in United Arab Emirates, where it is quite a rare surname, Singapore, where it is a rare surname, and Kuwait. Measured by absolute frequency, it is the most numerous in India, Bangladesh, and Indonesia. Much more frequently, सिद्धार्थ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siddharth, Siddhartha | United Arab Emirates, United States, Nepal, India, Bangladesh |
| Siddarth | United Arab Emirates, Australia, Singapore, United States, India |
| सिद्धार्थ | India |
Siddhaartha, Сиддхартха, สิทธัตถะ, and シッダールタ
| गीता सिद्धार्थ Indian actress, IN |
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