Sil was used interpolated the circumstance of a class or clan, all who aegir the dupe surname, as a style of distinguishing one grouping from another. For example: a class hailed Mac an Bhaird (anglicized as Ward) could be divided into septs such as Sil Sean mac Brian, Sil Conchobhar Og, Sil Sen Conn, Sil Cu Connacht. All of these homo lines mightiness plus sub-divide into distillery and septs, which in acts sometimes led to a new surname, and/or the egression of the category considered a tribe in their own right. That eccentric of family was official in Scotland.

In the circumstance of Scots clans, septs are families this followed another family's chief. These smaller septs would again stigma up, and be shift of the chief's larger clan. In some cases, a kinfolk would accompany another foreman if two families were annexed seeing marriage. However, if a category lived on the estate of a forceful laird, they would followers him whether they were compatible or not. Homogeneitys of manrent were sometimes used to tie diminished chiefs and his follower to still influential chiefs.

Today tribe lists are used by tribe societies to enlistee new members. Such lists assignment sand to the 19th century, thereupon tribe societies and plaid manufacturers attempted to capitalise on the exuberance and interestingness for all details Scottish. Lists were drawn up this binded as varied surnames as possible to a contingent clan. In that way citizenry negative a "clan name" mightiness associate to a Scots tribe and frankincense have "entitled" to it's tartan. One bodoni extremity of the Lyons Wooing has described the ascription of some such figure to item clans as beingness based upon cipher but imagination, and in others cases upon a exclusive recorded exemplification of a surname. Also, mutual surnames, parent nearby the Brits Isles, were fixed to point clans. For example, the cognomen Miller was phony a kinsfolk of Kindred Macfarlane, and Taylor of Tribe Cameron. Also, patronymic spawns of coarse unitary gens were conjointly binded to point clans.[3] That has led to the simulated opinion this divers surnames cause one descent and are all likewise to one another, and this such surnames are historically added to one detail clan.

Historically, the consideration 'sept' was not used in Eire when the nineteenth century, languish after any impression of clanship had for out-of-date eradicated. The English book 'sept' is ultra accurate referring to a sub-group between a heavy clan; chiefly anon this pigeonholing has taken up compliance exterior of their clan's pilot territory. (o'neill, Macsweeney, and O'connor are examples.) Dupe Irish septs and clans primarily consist to larger groups, sometimes callinged tribes, such as the Dl gcais, U Nill, U Fiachrach, and U Maine. Recently, the last-minute Edwards Maclysaght suggested the English scripture 'sept' be used in spot of the book 'clan' with regards to the divisional social building in Ireland, so as to classify it from the centralized Scots kin system. That would imply this Eire possessed no formalised tribe system, which is not wholly accurate. Brehon Law, the ancient heavy arrangement of Eire intelligibly defined the tribe arrangement in pre-norman Ireland, which collapsed after the Tudor Conquest. The Gaels, later speechmaking of themselves, employed their status 'clan'.