McLoughlin

"[1] A small DNA sample size; so far, shows the clans origins are in Donegal[2] Lochlan(n)/Lochlain(n) is still used as a man's personal name in Ireland and Scotland, though not commonly.

English forms of the surname Mac/Nic Lochlainn are concentrated in western Ulster, on both sides of the international boundary.

But the family are found throughout Ulster, and spread eastward during the Middle Ages, across the North Channel into Scotland where they became the Clan MacLachlan.

The surname was originally rendered O'Melaghlin in Norman French and Middle English but was corrupted to McLoughlin and M'Loughlin in the 18th century.

[4] The Lochnaigh family in Connaught, who claim descent from the Uí Fiachrach dynasty, mostly became Loughney in English but are very occasionally called McLoughlin.