Male individuals, from a Swedish reference population, with identical 17 loci Y-chromosomal STR haplotypes were analyzed with more than 900,000 autosomal SNPs in order to estimate their degree of genetic relatedness. This study shows that even though identical Y-STR profiles are shared, there is no evidence that these individuals are related to a higher degree compared with randomly unrelated male individuals in the Swedish population. Based on the results in this study, we conclude that the data do not show any signs of a biased sampling when it comes to the studied male individuals representing the Swedish reference population. © 2017 Elsevier B.V.