Aghadowey does it again with that will, the townland made me focus Ballynacooley Toome County Antrim which is in Duneane civil parish
I stopped before 1901 census so no Cargin entries but you should find an earlier relative or something of interest griffiths valuation has continuation books online at PRONI
1796 Flax growers of co antrim none found
1823-1837 Tithes Applotment Books based upon the index work of the Irish Genealogy Hub The relevant original books are in the
Public Record Office of Northern Ireland (PRONI) Belfast
Keyland, John-Townland: Lurgill Year: 1833- Ballinderry -Antrim
Keylan, Wm.-Townland: Ballynacooley Year: 1833-Duneane-Antrim
Keylan, Wm.-Townland: Killyfadd Year: 1834- Drummaul -Antrim
Keyland, James-Townland: Aghadolgan Year: 1834- Glenavy-Antrim
Keyland, James-Townland: Aughadalgan Year: 1826- Glenavy-Antrim
Keyland, John-Townland: Aghadalgon Year: 1826- Glenavy-Antrim
Keyland, John-Townland: Aghadolgan Year: 1834- Glenavy-Antrim
Keyland, Chas.-Townland: Ballyvannan Year: 1826- Glenavy-Antrim
Keyland, Daniel-Townland: Ballyvorally Year: 1826- Glenavy-Antrim
Keyland, Daniel-Townland: Ballyvorally Year: 1834- Glenavy-Antrim
1860ish Griffiths Valuation of Ireland with thanks to
http://www.askaboutireland.ie/griffith-valuation/ for detail and map ref use
http://www.askaboutireland.ie/griffith-valuation/Surname First Name Townland Parish County sorted by parish then by townland
Keyland Maria Clonboy Drummaul Antrim
Keyland Daniel Aghadolgan Glenavy Antrim
Keyland James Aghadolgan Glenavy Antrim
Keyland Maria Aghadolgan Glenavy Antrim
Keyland William Aghadolgan Glenavy Antrim
Keyland Charles Ballymacricket Glenavy Antrim
Keyland Maria Ballymacricket Glenavy Antrim
Keyland Daniel Ballyvorally Glenavy Antrim
Keyland William Ballyvorally Glenavy Antrim
Keyland Daniel Edenturcher Glenavy Antrim
however I turned up the occupants list and said the name out loud and think this is the best clue for me to follow up
KILLEEN JAMES ANTRIM DUNEANE 1862 map ref 7a 7 acresabove railway line
KILLEEN JAMES ANTRIM DUNEANE map ref 7b 25 acres the house valued at £2 five shillings is the best in the townland. looking up their map ref tells me its just south of old railway line and its drive exists on modern maps there are two entries driveway the first house is modern and closeto the road I guess its no 2 Ballynacooley Rd the older one is Unnamed Road Antrim BT41 3NA54.707428, -6.386330 but numbered 4 Ballynacooley Rd and I see white pebbled dash cottage at top of drive is it the old family Keyland /Killeen homestead
KILLEEN JAMES ANTRIM DUNEANE map ref c 2 above railwy line
Ballynacooley
but why so few in census 1901, is it employment in Belfast ot have they all emigrated 2 did from Belfast port james aged 40 and john aged 26 but doesn’t say from a location 28 aug 1849 which could be the famine see
http://www.castlegarden.org/search_02.php?m_ship=&po_port=&p_first_name=&p_last_name=keyland&o_occ=&co_country=&province=&town=&m_arr_date_start=1820&m_arr_date_end=1913&submit.x=63&submit.y=2other sources
https://www.GenesReunited.co.uk/tree/results/keyland?memberkey=0&yearofbirthrange=0&birthplace=irelandthe chief tree owner for Co Antrim Keyland is “ella” followed by Kathleen,,june godfrey Roy,Debbie , there are 25 entries. earliest entry is
Mary Keyland 1752 Co Antrim N Ireland ...
No Keylands found
you would probably have to join to ask permission to see the trees others have.
however currently on line are 60 brief entries for keyland at
https://www.ancestryireland.com/search-irish-genealogy-databases/?search1=&search2=keyland&submit=Search+All births 22 earliest1830 but they give fathers names so you can try to make trees yourself
marriages 34 earliest 1840, some fathers names used
also familysearh.org and emerald ancestors
PRONI lookup their Wills among there many otherdata base
GOODLUCK ONWARDS