O’Diomhain Sept to Clan O’Cahan County’s Derry and Antrim Northern Ireland The lineage is deeply rooted in Counties Londonderry and Antrim, Northern Ireland along the Lower Bann River. Once O’Diomhain the spellings are now Diamond and Dimond. The Dimond/Diamonds were an erenagh family of Kilrea, which means the family owned the land that was used for the place of worship and generally provided those who ministered there. Erenagh is from the Gaelic 'ceann' meaning head, leading, principal; some use it to mean 'stewardship' or 'the keeper of'. The early Celtic church differed in structure from the rest of western Christianity in that it did not have dioceses. Instead, it was monastic, that is, each area was an independent church governed by an abbot and each parish had its own bishop elected from a local erenagh family. The lineage can be defined by high resolution STR haplotype (111 markers) and by membership in Y haplogroup I-L126.