Etymology
A commonly misconception is that Dwivedi means a person who has the knowledge of two Vedas. Dwi meaning "two" and vedi referring to the Hindu scripture Vedas. Similarly, the names Trivedi (tri meaning three) and Chaturvedi (chatur meaning four) offer a parallel, The fact is It's not entirly depends on surname. In bhramin society the "Gotra" and "Orign" is much more important than the "surname". For example if a Dwivedi belongs to Upamanyu is more near to real blood of origin than the other Dwivedi. According to Different Gotras Vanshavali(Family Tree) which was very common and inportant before 1970, It is clearly mention that bhramins also follow the "Biswa" system.More count of Biswa more will be his seniorty and Grade. Take a example that a bhramin have Upmanyu Gotra and his have 20 Biswa is more purity than the other bharamin have less Biswa. Biswa measurement tells the purity of blood and it is same as Carat measurement of gold. there are only Few type of origin of bhramin which have the acceptibility of highest 20 Biswa purity and these are Gharwas ke Dubey,Balaa ke Shukla,Nabelpuraniya ke Shukla,Gopal ke Tiwari,Dama ke Tiwari,Gowardhan ke Tiwari,Sattu ke Tiwari Some Awasthi ,Some Bajpayees and many more etc.
The Trivedi and Chaturvedi words are nor exist in Vedas nither in Vanshavalis(Family Tree). The Trivedis are basically are Tiwari bhramin and Chatuvedis are Sharma or other bhumihar bhramins.It is clearly mention in thier Vanshavali that a son of tiwari changed his name to trivedi.
If we talk about the Knowledge of all 4 Vedas,During the 'Janave ' (holy thread) ceremony it is mandatory to all bhramin (irespective of biswa) to get the learning of all 4 vedas.Without the learning of all 4 vedas the ceremony cannot be start.
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