Surname সিদ্ধার্থ (Siddharth 
, Siddhartha , Sidharth ) , all over the world, is quite a common family name. The surname সিদ্ধার্থ is characteristic of Western Asia, particularly United Arab Emirates, where it is quite a rare surname, Kuwait, and Qatar. In absolute terms, the name is most common in India, United Arab Emirates, and Bangladesh. Much more prevalently, সিদ্ধার্থ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siddharth, Sidharth, Siddhartha | Nepal, United States, India, Bangladesh, United Arab Emirates |
| সিদ্ধার্থ | Bangladesh |
Siddhaartha, and سيدهارتا