From frustrating fragments of the 1851 census, the only John McM* I could find are the following
http://www.ulsterancestry.com/ShowFreePage.php?id=1721851 census Dunaghy civil parish
I could find no trace of Bracan Bracen, Bracin, Braken etc
21 Ballycregagh Townland , Dunaghy County Antrim (1851)
David Mcmullin, Head, ....,
John Mcmullin, Son, U, 13, Linen Weaver, Ant,
....
11 Caragan Townland , Dunaghy County Antrim (1851)
Neal Mcmullan, Head, M, 53, Labourer, Ant,
...
John Mcmullan, Son, U, 12, At School, Ant,
........
2 Caragan Townland , Dunaghy County Antrim (1851)
Bernard Mckart, Head, U, 24, Linen Weaver, Ant,
Nancy Mckart, Mother, W, 64, None, Ant......,
John Mcmullan, Nephew, U, 12, At School, Ant,
Bracan Bracen, Bracin, Bracken, Brackin, Brakin etc seem a scarce name in the north, the references one I could find in
Bracen. Joseph Corkish in Bailieborough Cavan see Griffiths valuation of Ireland ~1860s at
www.askaboutireland.comAnd from
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/John BRACKIN Bright died 30 May 1819 aged 70; buried Killough graveyard MIs
Thomas BRACKEN Bright of Killough; died 19 Dec 1859 aged 73;buried Killough graveyard MIs
William BRACKEN BRAKEN . Down son of Andrew Bracken ; married Eliza Brown 30 Nov 1853 ; emigrated to USA; Eliza died in New York 17 Mar 1872 CR; AG 10/5/1872
The Irish Times ancestry doesn’t list Bracan at all bit does list
SURNAME
Ó Breacáin
Bracen
Brachan
Brackan
Braken
Breaccon
Breckan
Breeken,
with a note the Bracken is a sept located on the borders of Kildare and Offaly in the Middle Ages and still flourishing there.MIF. The Ó Breacáin seems to have a Belfast location.
Thats all I can offer
good luck onwards JimG