O Dinerty. A Sept / Family branch, who had their territory in Co. Tipperary in the north - east of Ormond / Aur Mhumhain / Eastern  Munster.

O Dingevan or O Dinnevan - Irish / Ua Dinneabhain. A Sept / Family branch, who had their territory in Desmond / Des Mhumhain / Southern Munster. Some also changed to Donovan. See also Ginnevan.

O Dinkin - Irish / Ua Duinnchinn / brown head. A Sept / Family branch, who had their territory in the north of the Connacht Province. Many also changed to Duncan.

O Dinneen - Irish / Ua Duinnin / donn - brown. A Sept / Family branch of poets and historians, who had their territory in Co. Cork in Desmond / Des Mhumhain / Southern Munster.

O Dinnegan - Irish / Ua Duinngain. Used as a variant for Donegan, which see, in Co. Longford in the north - west of Northern Leinster.

Dinsmore. Scottish origins. Used as a variant for the Fifeshire toponymic Dunsmore. They were in Co. Derry and Co. Donegal in Northern Ulster.

O Diocholla. An Irian Sept / Family branch, who had their territory in the west of Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster where they were the Chiefs of Corcomroe with the O Mullethys / O Multhys. Ancestor - 37.Ir (Irians).

O Dirrane or O Derrane - Irish / Ua Dearain. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht.

O Dirreen - Irish / Ua Dirin. A Sept / Family branch, who had their territory in Co. Kilkenny in the south - west of Southern Leinster.

O Diskin - Irish / Ua Discin - diosc / barren. A Sept / Family branch, who had their territory at Ballydiscin in Co. Sligo in the north - west of the Connacht Province and now also in the south of Connacht.

Disney / de Isigney. French origins. They were in south of Ireland and Northern Leinster since the early 17th Century AD.

Mac Diver - Irish / Ua Duibhidir. A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cenel Conaill Sept, who had their territory in Tir Connaill / Tyrconnell (The Land of 88.Conall) in Co. Donegal in the north - west of the Ulster Province. Some changed to Deere. while Mac Dever was also used in Co. Mayo in the mid - west of the Connacht Province. See also Mac Dyer. Ancestors - *88.Conall "Gulban" the 1st King of Tir Conaill / Tyrconnell (Cenel Conaill), *87.Niall of the Nine Hostages  the 126th King of Tara / Ireland (Ui Niaill).

O Divine or O Diveen - Irish / Ua Duibhin. A Sept / Family branch, who had their territory in Co. Derry in the north - east of the Ulster Province, and Co. Tyrone in Central Southern Ulster. Elsewhere indistinguishable from Devine.

O Diveney or O Divenny - Irish / Ua Duibheanaigh - dubh / black - eanach. A Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. Cognate also with Devanny.

Dix. Irish origins. They were in France known there as de Aix.

Di. Used as a variant for Dick, which see. They were in Co. Dublin in the north - east of Southern Leinster since the Mid - 17th Century AD.

Dixon. See - Dickson.

                                                                                       +On to Doag - Dolohunty