Hai rakesh, As far as I know the Gothram refers to which family tree you originated from and its the name of a rishi, Kashyap, Vishwamithra etc. This means that people who say kahsyap as gothra their oldest known ancestor is kashyap rishi and they should avoid marrying in same gothram to ensure healthy genetic crossing.
It should be a matter of scientific study if there is indeed genetic similarities between people of same gothram though now it may not be so relevant since we should be a thousand generations away from original rishis.
If you say your gothram is shiva then you are effectively saying that your oldest known ancestor is Shiva.
Its needed during prayers because the good karmas of a prayer/pooja gets shared by all ancestors from your gothram, which is what your duty is.
So when you say Shiva , you are doing favor to the entire humanity.
Anu Babu, Featured Member on
This information comes from my own knowledge.
A Gotra is the lineage or clan assigned to a Hindu at birth. In most cases, the system is patrilineal and the gotra assigned is that of the person's father. Other names used to refer to it are Vansh, Vanshaj, Bedagu, Purvik, Purvajan, Pitru.
Hindu Caste: Pillai (sozia vellala) , Mudaliar normally fall under siva gothram.
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