Eka Rishi And Rare Gotras Pravara List

And over a period of years Brahmins have started using their professions as their surnames ,as against the Hindu practice of using Sharma as their surname and for indentification their Pravara/Abhivadan Mantra.

So when one has a surname like Upadhyaya it merely denotes the profession and not a caste.

To find it one has to check the Pravara.