If you take a look at the Crotty's from Cork, you will see the last 20 listings with the Parish Lismore Mocollop,
both Crotty and Boozan have the Parish Cloyne and Milmahon in common.
Garrett Crotty, Parish Kilmahon, Townland Shanagarry S.
1852 Griffith Valuation is also a census substitute for Cork
Ellen Crotty, Parish of Kilmahon, Townland Ballylongane,
Poor Law Union Middleton, tenant of Peter P. Gaskell
#3a house, outbuildings land 48 acres 0 roods 31 perches
John Crotty, Parish of Kilmahon, townland Shanagarry N.
PLU Middleton, tenant of Peter P. Gaskell
2a house, oubuildings and land 41.0.22
4a Matthia Boozan house, oubuildings and land 35.1.18
1881 John Crotty, Main Street, Lismore listed under Linen & Woollen Drapers & Haberdashers
(don't know if this is your John Crotty as he would be
74 at least by then?
1901/1911 census: www.census.nationalarchives.ie
#2 Market Street
Thomas 63 Tailor, born Waterford Tailor
Nora 50 seamstress, born Waterford
John Crotty, Fermoy Urban, Cork, born Co. Waterford, Tailor age 31
Ellen 28 seamstress born Waterford
William 28 Tailor born Waterford
1911: #2 Old Market St. Fermoy, Cork
Thomas 71 Master Tailor
Nora 67 married 43 yr. 2 born/ 1 living (doesn't seem right)
John 42 *married, Tailor
Ellen 38 *married 11 yr. 5 born 4 living
Thomas 5, Norah 7, Eilleen 2
2 servants/employees, Tailors
ps you could look in the Cork telephone book and find Crotty's still living in areas as above and write a few
with apprentices and workmen
You should be able to find the marriage of Mary & Thomas
in records. The North-East of Cork is covered by an
Irish History Foundation www.rootsireland.ie
this is a pay website but not for profit.
other parts of Cork:www.irishgenealogy.ie
(church records) free