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Sapere Aude Incipe
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The haplogroup BY3105 appears to be the start of a very ancient Birnie surname lineage( possibly 838 AD to match the legends of Birnies ). 

BY3105* > McBurney ( Big Y kit 170555 )
BY3105   > FGC5581* > McBirnie ( kit 156437 )

There are around 12 stable SNPs beneath BY3105 after the split in the above branch.  This could easily originate in 838 AD. However, most surnames didn't start until well after the Norman conquest a few hundred years later.