Ros Davies great website
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/ has more Culls listed than this extract, I included Clonallen, Kilbroney and was tempted by Kilkeel.
Messrs. . CULLS . Kilbroney of Killowen Terrace , Rostrevor in 1910 POD
Bryan CULL . Kilkeel a farmer in Drumcrow in 1803 LDR
Daniel CULL . Kilkeel married Rose Magee 22 Oct 1840, Catholic church PR
Ellen CULL . Kilcoo sponsor at the baptism of Owen, son of Stephen Fitzpatrick & Mary Cull 15 May 1873 at Catholic Church PR
Henry CULL . Kilkeel husband of Cathrine Clark; father of Henry b. 8 Jan 1869 CR
James CULL . Kilkeel school master at Killowen & Mourne school in 1836, a Catholic V3 p 38 OSM
James CULL . Kilkeel of Lisnacree; a surveyor; will probated in 1843 IIW V4 p 166
John CULL . Kilbroney owner of schooner 'Boston' which was lost 3 Jul 1880 BoTWR/MB
John CULL . Kilkeel husband of Ellen McGlew/ McGee; father of John b. 10 Jul 1868 & Margaret b. 7 Feb 1871 & Edward b. 17 Feb 1874 CR
Margaret CULL . Kilbroney sponsor at the baptism of George, son of Michael O'Hare & Margaret Bassan 21 Dec 1872 at Catholic Church PR
Margaret CULL . Kilkeel sponsor at the baptism of Anne , daughter of James Sloane & Sara McCartan of Maghereagh 22 Apr 1855 at Lower Mourne Catholic Church PR
Miss. Mary /Maria CULL . Kilbroney wife of .... McKeely; mother of John bpt. 17 Nov 1833 at Kilbroney Catholic Church PR
Miss Mary CULL . Kilkeel married Hugh Lavery Jan 1843, Catholic church PR
Michael CULL . Kilkeel a farmer in Drummanlane in 1803 LDR
Patrick CULL . Kilbroney sponsor at the baptism of William, son of Hugh Cole & Bridget Trainor 15 Sep 1815 also witness at the marriage of Thomas Gribben & Bridget Rice 21 Oct 1821 at Catholic Church PR
Patrick CULL . Kilbroney regd. Rostrevor; husband of Catherine Allen; father of Catherine b. 22 Oct 1869 CR
Patrick CULL . Warrenpoint a spirit & porter dealer in Warrenpoint in 1846 POD
Stephen CULL . Kilkeel married Mary Doyle 7 Sep 1843. Catholic church PR
Thomas CULL . Clonallan of Clontifleece; will probated 1836 IIW V4 p30
Thomas CULL . Kilkeel a farmer in Greencastle in 1803 LDR
William CULL . Kilkeel farmer in Donavil in 1803
Good luck, Jim