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Studies looking at the origin of the Sinhalese have been contradictory. Older studies suggest a predominantly Sri Lankan Tamil contribution followed by a significant Bengali contribution with no North Western Indian contribution, while more modern studies point towards a predominantly Bengali contribution and a minor Tamil and North Western Indian ( Gujarati & Punjabi ) contribution.

Multiple studies have found no significant genetic difference between the Sinhalese and the three other major ethnic groups in Sri Lanka ( Sri Lankan Tamil, Indian Tamil and Sri Lankan Moor ).