Hi Margaret
There are a couple of different baptism records on www.rootsireland.ie/:
Name:Mary MahonyDate of Birth:
Date of Baptism:10-Jan-1846Address:King StParish/District:MITCHELSTOWNGender:FemaleCountyCo. Cork
Denomination:Roman Catholic
Father:Bartholomew MahonyMother:Elizabeth McElligottOccupation:
Sponsor 1 /
Informant 1:Joseph Richardson Sponsor 2 /
Informant 2:Margaret McElligott
Notes:
PRIEST: C MC CARTHY
E CHILDS NAME AS[MARIA]
Name:Ellen MahonyDate of Birth:
Date of Baptism:21-Mar-1852Address:KiltrislaneParish/District:MITCHELSTOWNGender:FemaleCountyCo. Cork
Denomination:Roman Catholic
Father:Bartholomew MahonyMother:Elizbeth CligotOccupation:
Sponsor 1 /
Informant 1:Bartholomew Mahony Sponsor 2 /
Informant 2:Jane Cligot
Name:Bartholomew MahonyDate of Birth:
Date of Baptism:03-Apr-1859Address:KiltrislaneParish/District:MITCHELSTOWNGender:MaleCountyCo. Cork
Denomination:Roman Catholic
Father:Bartholomew MahonyMother:Elizabeth CligottOccupation:
Sponsor 1 /
Informant 1:Thomas Lane Sponsor 2 /
Informant 2:Margaret Donegan
Seems to confirm your theory of the interchangeable surname.
The marriage record isn't on roots but the National Library has the R C registers freely availabe at registers.nli.ie/; Mitchellstown marriages start in July 1845 there. www.irishgenealogy.ie/ (Church records) is good for Cork records too
Bartholomew's occupation - this link http://www.failteromhat.com/ has a couple of 1846 Mitchellstown Commercial Directories you could have a look through in case he was a businessman.
Col
