The townland of Killynumber is postulated as being derived from Cúil an Umair meaning "recess of the trough or hollow", with a noticeable hollow lying within the townland.
History
Population
Year
Pop.
1841
121
1851
100
1861
80
1871
64
1881
65
1891
64
1901
38
1911
44
1926
35
^[a] - decrease is attributed to emigration and removals
Size (acres, roods, poles)
Year
a, r, p
1851
180, 0, 33
1881
180, 0, 33
1901
180, 0, 33
1926
180, 1, 32
Earlier recorded forms
Year
Form
1609
Coulanamour (O.S.)
1613
Cowlanamone (Charter)
1622
Colnumer
1654
Cullnumber
1657
Coulananonie
1659c
Cooleminiber
1661
Cullminiber
1663
Cullnamer
1767
Killinumber
1813
Killynumer (S.M.)
(O.S.) - Ordnance Survey map (1609) (Charter) - Charter of Londonderry (1613) (S.M.) - Sampson's Map
^Northern Ireland Environment Agency. "NIEA Map Viewer". Archived from the original on 24 November 2011. Retrieved 27 January 2012.
^ Toner, Gregory: Place-Names of Northern Ireland, page 127-8. Queen's University of Belfast, 1996, ISBN0-85389-613-5
^ Notes on the Place Names of the Parishes and Townlands of the County of Londonderry, 1925, Alfred Moore Munn, Clerk of the Crown and Peace of the City and County of Londonderry