So many different possibilities- maybe something in family Wills?
Probate of the Will of Henry Pickering late of Durnascallon, Co. Londonderry, farmer, who died 13 January 1918 granted at Londonderry to Rev. William Wilson Mercier, Dromore, clerk in Holy Orders and James Corr, Durnascallon, farmer. Effects: £22 10s 0d
McGuckin John Wesley of "Hollymount" Durnascallion Desertmartin county Londonderry farmer died 16 July 1931 Probate Londonderry 18 March to George McGuckin farmer. Effects £372 6s. 8d
McGuckin Robert of Hollymount Desertmartin county Londonderry farmer died 2 November 1954 Probate Belfast 3 January to Dermot Storey Badger solicitor. Effects £1882 16s. 6d