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The sentence ""The exact origin of the word Bangla or Bengal is unknown"" is misleading and erroneous .The word ""Bengal"" is derived from the root Sanskrit word ""Banga"" or Vanga .
This being the case how can you say that the origin of the word "" bengal"" is unknown.
I am not under any impression that Vyas named everything. But it is very much clear that the place name ""Vanga"" existed from the times of Vyasa. - "