The British introduced that system, aligned on the Western European system (not everywhere, though, Iceland is an outlier). That's why you have people like Padmasree Warrior, one of her husband's ancestors put his profession as his last name when the British asked for one, and it stuck. Then again, many English surnames are also based on profession, one of Jimmy Carter's ancestors literally made carts.
https://en.wikipedia.org/wiki/Variar
Is a caste who have traditionally rendered temple services. it is not related to the english word or meaning warrior.
The caste name also differs from region to region. I am not sure if the person you mentioned is the same caste or a different one.
Caste does not say your ancestors did that job, caste meant a person from a particular caste could only do that job and could not take up other jobs, people from other castes could not take their jobs and were disqualified because you were not born in a particular list of families.
Some castes were prohibited from getting an education and were killed for this.
