Y-Chromosome DNA (Y-DNA) haplogroups and subclades names follow the conventions of the Y-Chromosome Consortium’s (YCC). The YCC short form names haplogroups with the first letter from the major haplogroup branch. This is followed by a dash and the name of the final SNP: S-M310, S-M254, S-P57, etc.

Note: Both mtDNA and Y-DNA tests provide haplogroup information. The haplogroup nomenclature is different for each.