Originally, neither. It emerged from Brittany, France.
Do you mean Brittany Susan Pears from Glee? If you do then that is her real name!
There is no Irish version of the name.
Patsy Irish's birth name is Patricia Rose Irish.
Yes, McClendon is an Irish name. :)
The Irish name for the area of France called Brittany is "An Bhriotáin". It probably won't work as a female name, just stay with Brittney.
Brittany Mumford's birth name is Brittany Shreve.
Brittany Ladolcetta's birth name is Brittany Anne Kemp.
Brittany Snow's birth name is Brittany Anne Snow.
Brittany Jorgenson's birth name is Brittany Paris Jorgenson.
Brittany Eldridge's birth name is Brittany Leigh Eldridge.
Brittany Drisdelle's birth name is Brittany Lee Drisdelle.
Brittany Clapper's birth name is Brittany Joanne Clapper.
Brittany Beers's birth name is Brittany Alyssa Beers.
Brittany Tiplady's birth name is Brittany Alexandra Tiplady.
Brittany Murphy's birth name is Brittany Anne Bertolotti.
Brittany Gray's birth name is Brittany Alexandra Gray.