The name Frenchbrook itself carries a suggestion of plantation-era naming, the kind of toponym that often marks land which changed hands during the sixteenth or seventeenth century, when English and continental settlers were granted or purchased holdings across Connacht. Whether the enclosure predates that period by centuries, as many Irish enclosures do, or is connected to later land use, remains a detail not currently in the public record.

Enclosures of this type in County Mayo range widely in date and function. Some are the circular earthen raths or ringforts of the early medieval period, used as defended farmsteads by farming families between roughly the fifth and twelfth centuries. Others are prehistoric, associated with Bronze Age or Iron Age settlement. A small number relate to ecclesiastical or monastic organisation. Without further detail it is not possible to say which category Frenchbrook falls into, but the bare fact of its classification as an enclosure places it within a tradition of land enclosure and territorial definition that runs deep through the Irish countryside, where such earthworks are often the most visible survivors of communities that left little else above ground.