I'm listing the folowing BMD for Byrne (and other spellings) which may be of some help to others. Have also included some cases where name appears as godparents or witnesses (in parenthesis). (B is baptism...these are all RC.) Microfilm in poor condition so some question marks if handwriting was unclear.
B 9/24/1820 Sarah to Ed & Anna(?) Byrne
B 6/15/1821 Lawrence to John & Bridget Byrne
B 8/1/1822 Anne to Thos & Mary Byrne (Cath. Byrne)
B 12/18/1823 William to Michael & Honor Byrne
B 6/24?/1826 John to John Byrne & Eliz Kelly
B 3/10/1827 John to Luke(?) & May Brine (James Byrn)
B 5/10/1827 James to Paul & Jinny Brine(?)
B 5/21/1827 Mary to Thos & Ellen Bine(?) (Mary Bine(?)
B 8/24/1827 Fanny to Thos Gannon & Biddy Byrne
B 8/17/1827 William to Pat Dugan & Bridget Byrn
B 10?/4/1827 Ellen(?) to Jno Halleron & Cath Byrne
M 2/24/1824 Edward & Bridget Byrne (Thos & Mary Byrne)
D 10/7/1881 William Byrne
B 8/15/1838(?) Cath to Wm Burns & Eliz Kelly (James Byrne)
B 12/19/1841 John to Wm Burn & Mary McDonald
B 2/?/1841 Elizabeth to Michael Byrne
B 6/26/1842 Mary to Wm Byrne & Mary McDonald
M 11/28/1820 charles Byrne(?) & Mary Pinder
M 2/21/1824 Ed Byrne & Brid Byrne (Thos & Mary Byrne)
M 1/29/1826 Thos Byrn & Mary Eland(?)
M 7/19/1826 John Byrne & Alty Murphy (Mich Byrne)
M 9/4/1826 Pat Byrne(?) & Judith Lawless(?)
M 12/1/1826 Patt Byrne & Brid McLaughlin
M 10/22/1837 Dan Bannon & Ann Mulhall (James Byrne)
M 2/25/1821 John Lalor & Honor Byrne
M 8/14/1821 Michael Butler(?) & Bridget Byrne
M 2/4/1823 Pat & Eliz Whelan (Cath Byrne)
M 4/15/1826 David Maher & Anne Byrne (Anne Byrne)
M 2/21/1824 Edward & Bridget Byrne (Thos & Mary Byrne)
M 8/5/1827 James Foley & Bidget Neal (Mgt Byrne)
M 10/15/1832 John Callaghan & Sarah Byrns