Mc Barron/ Mac an Bhairun (Son of the Baron)
comes from a branch of the O'Neills of Ulster Ireland. The Mc Barrons are descendants of the Baron of Dungannon (one of the titles held by the O'Neills)
Inextricably linked with the O'Neills they were marginalise after the latter were defaeted by Queen Elizabeth in her conquest of Ulster. The key engagement of this war was in Kinsale in Co. Cork on the south coast of ireland in 1601 They lost their land and titles.
In the 1840s many people of the McBarron name(and various distortions of it) are recorded in the ships logs of the "coffin ships" fleeing the famine in Ireland. Today you will find McBarrons prominent in Donegal and Fermanagh neighbouring counties in Ulster. There are far more in America however.