John might have been referring to St. Finbarr Cathedral (Current cathedral was built in 1862. There were previous structures) which is in the South Parish of Cork. Or he might be from one of the townlands in St. Finbarr civil parish.
Church of Ireland
Saint Fin Barre's Cathedral - Wikipedia
Roman Catholic
St. Finbarr's South Church - Wikipedia
South Parish, Cork - Wikipedia
Townlands in St Finbar's
I found two Roman Catholic baptisms in South Parish for a John O'Connor on Irishgenealogy. One might be yours.
Irish Genealogy - Explore your Family History
Baptism record for JOHN CONNOR on 02 May 1821
Area - CORK & ROSS (RC), Parish/Church/Congregation - CORK - SOUTH PARISH«
| Name: | John Connor |
| Address: | |
| Father: | John Connor |
| Mother: | Mary Tobin |
| Further details in the record |
| Child Denomination: | |
| Sponsor 1: | John Kenelly |
| Sponsor 2: | Catharine Connor |
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Baptism record for JOHN CONNOR on 31 December 1822
Area - CORK & ROSS (RC), Parish/Church/Congregation - CORK - SOUTH PARISH«
| Name: | John Connor |
| Address: | |
| Father: | John Connor |
| Mother: | Ellen Callaghan |
| Further details in the record |
| Child Denomination: | |
| Sponsor 1: | Timy Tobin |
| Sponsor 2: | Mary Slack |
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Marriage record for JOHN CONNOR and MARY TOBIN of CAP WELL on 19 May 1807
Area - CORK & ROSS (RC), Parish/Church/Congregation - CORK - SOUTH PARISH« Back to results
| HusbandWife |
| Name | JOHN CONNOR | MARY TOBIN |
| Address | | CAP WELL |
| Occupation | | |
| Father | | |
| Mother | | |
| Further details in the record |
| Witness 1: | SIMON SULLIVAN (WITNESS FOR HUSBAND) |
| Witness 3: | DAN CONNOR (WITNESS FOR WIFE) |
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