Overview
Haplogroup R-FGC11136 is a downstream branch of R-DF13 that emerged during the late Bronze Age and represents one of the smaller but phylogenetically informative lineages within the broad R-L21 structure. FGC11136 appears to have diverged early from other DF13 expansions, forming a stable but regionally contained paternal group. Because of its modest size and restricted spread, it provides valuable insight into the micro structure of early Celtic and proto Celtic populations in Britain and Ireland. Unlike the major DF13 expansions such as DF21, DF49 or M222, FGC11136 did not participate in large scale demographic growth. Instead, its presence suggests continuity within localized Bronze and Iron Age communities that maintained smaller family clusters over generations. These groups survived major cultural transitions, including the rise of Celtic speaking societies, the Roman period in Britain and the political fragmentation of the early medieval world. Modern carriers of FGC11136 are most frequently found in Ireland, Wales and western England, indicating a long standing association with Atlantic cultural zones. The lineage displays several downstream branches that likely formed during the early medieval surname era, consistent with patterns observed in many R-L21 derived lineages. Its stable but limited distribution makes it useful for genealogical and regional population studies aimed at reconstructing paternal histories of western Britain and Ireland.