The early male founders originated from Scotland, England, the Netherlands, the United States, and Italy, who belonged to three Y-haplogroups: I (M170), R-SRY10831.2, and R (M207) (xSRY10831.2). The male founders shared nine surnames: Collins, Glass, Green, Hagan, Lavarello, Repetto, Rogers, Squibb, and Swain. In addition, a new haplotype was found that is associated with men of eastern Europe and Russia. It entered the population in the early 1900s, at a time when the island was visited by Russian sailing ships. There is "evidence for the contribution of a hidden ancestor who left his genes, but not his name, on the island." Another four instances of non-paternity were found among male descendants, but researchers believed their fathers were probably among the early island population.