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A sept is an English word for a division of a family, especially of a
Síol is a Gaelic word meaning "progeny" or "seed" that is used in the context of a family or clan with members who bear the same surname and inhabited the same territory, as a manner of distinguishing one group from another; a family called Mac an Bháird (
Each of these individual septs may further subdivide into more septs, which may sometimes lead to the development of novel surnames and/or the rise of the family such that it may be considered a clan in its own right. Such septs were common in Scotland, where the clan system was well-developed.