1823-1837 the only Gillian's listed are in Parish Calry 1829 and the Townland of Loughanelteen
names: Mat; Jno; Matw; John (no further detail)
Griffith Valuation took place in Sligo 1858:
At this time there are 88 Gilligan's, 10 of whom are Michael's in 5 different Parish's.
Parish Drumcliff; Easky; 3xKillaspugbrone; 2xKilmacowen; 3x St. John's.
There are just 3 listings for the surname Kivlehan/Kivelehan's.
The Parish's listed are 2 in Drumcliff and 1 in St. John's.
You can see the Gilligan's on www.askaboutireland.ie
Michael Kilevlehan, Parish of Drumcliff, Townland Rosses Lower, Poor Law Union Sligo
tenant of Edward J. Cooper
#2a house, outbuildings and share of 209 acres 2 roods 11 perches
3b is occupied by Michael Gilligan with land and house 11.3.20
#10 Michael Kilevlehan land only 5.1.25
Michael Kilvahan, Parish of St. John, Townland of Knappagh Beg, Town of Sligo
tenant of John Given
#10 Knappagh-Road (south side) house and garden 0.0.26
Directories of Ireland:
Michael Kivlehan 1845, listed under Block & Pump Makers & Turners, Lower Knox St.
Baptism, marriage records: www.rootsireland.ie
(a pay web site)
Drumcliff, CofI 1805-1890; St. John's Union CofI 1802-1900
both web sites have a variety of resources.