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Last name Siddhaartha (Siddhaartha ) , in the entire world, is an extremely rare family name. Predominantly, Siddhaartha is the forename as well as the last name.
सिद्धार्थ, সিদ্ধার্থ, and ಸಿದ್ಧಾರ್ಥ
Rath, Jain, and Sadhasivan Gayathri