Holleran /Halloran / O Holleran in Cork - Margaret's parents and Marg/Mary birth cert??

Hello, I am trying to ind parents of MARGARET-- or MARY Holleran / Halloran - can't find her b.cert around 1806 (1801-1810, us census usually 1808 ish) her d. cert says her parents are John and Catherine Holleran

-- records seems Cork (marr record Bandon, Cork  in prev. answer here ) 1831

--in some records after immigr to Boston shows up MARY instead of Margaret.  -- 

soo-- i tried MARY and also John and Cath on irish genealogy and found a couple of records in Killmurry, Cork 

`.1. is this close to Bandon? 

-- 2. Can this be her b cert??  John  Halloran  /Holleran and Cathne Brown /Browne (one looks like dupe record ) --with 1806 April and March 10 --same names diff spellings. one spelled Holleran one spelled Halloran. 

 

-- one family John and Cathne Brien- a couple ch. listed but no Marg/Mary listed.  but

-- there is a Tim Halloran and Cathe Brien listed as sponsors on a Margt Halloran marr. cert Bandon `1831 to Con Dacy which is who the Marg/Mary i'm looking for married. 

-- there is a Michael Holleran as sponsor in later records in Mass. with family.

(trying to find all John Halloran around 1800's area with a Catherine (sp) variation around Cork, Bandon

-- Innishannon also comes up with names (and Tracton Abbey) 

Thanks for any insight