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Anglicized form of Gaelic Ó Diamáin ‘descendant of Diamán’, earlier Díomá or Déamán, a diminutive of Díoma, itself a pet form of Diarmaid. Jewish (Ashkenazic): Americanized form of a Jewish surname, spelled in various ways, derived from modern German Diamant, Demant ‘diamond’, or Yiddish dime(n)t, going back to Middle High German diemant (via Latin from Greek adamas ‘unconquerable’, genitive adamantos, a reference to the hardness of the stone). Anglicized form of Gaelic Ó Diamáin ‘descendant of Diamán’, earlier Díomá or Déamán, a diminutive of Díoma, itself a pet form of Diarmaid (McDermott). All the variants probably derive from Dayman -a personal and occupational name; Herdsman. The ptolemaic Emhain Mach
Dinan, also spelt Dynan, is certainly a Munster name now and primarily of Co. Cork, and it appears as such in the "census" of 1659. Even after the destruction of the Gaelic order the literary tradition of the O'Dinneens was continued, Tadhg O'Dinneen, poet to the Earl of Clancarty, being a prominent member of the seventeenth century school of poetry at Blarney. Dol & Dinan and The family of Dinan (Dinant, Dynant) possibly descended from Dunna
O' Dinan; O'Dinnahan is sometimes used synonymously with Dinneen in Co. Cork. Dinan is a distinct name, Ó Daghnáin, O'Diaghaidh in Irish and the sept belonged to Counties Cork and Clare. It belongs to Munster especially Counties Cork and Clare. A variant in Irish, found in counties Tipperary and Waterford, is O'Diaghaidh anglicized as Dee or O'Dee and O'Dea is a name associated alike in the past and present almost exclusively with the County Clare and the areas such as Limerick City and North Tipperary which immediately adjoin it. It is not a common name elsewhere and even in County Clare.The normal pronunciation of the name in English is approximately O'Day and in some places it is anglicized as Day, but persons so called are not numerous in Ireland and some may be of English extraction since Day is a common name in England. O'Dea appears in the political, military or literary history of Ireland but several are mentioned by the Four Masters and one Cornelius O'Dea (d. 1434), was Archdeacon of Killaloe and later Bishop of Limerick. Also, O'Dea, chief of Dysart-O'Dea, now the parish of Dysart, barony of Inchiquin, county Clare. Irish chief and clans of ancient Thomond (Co. Clare)
County Limerick landscape from the rural mountains of Ballyhoura, the beautiful Golden Vale in the east of the County through to the tidal estuary of the River Shannon. In 978, the Battle of Belach Lechta in Ballyhoura mountains in north Cork. Brian Boruma mac Cennetig (Brian Boru) defeats and kills Mael Muad mac Brain and becomes king of Munster. A particular feature of the county is its range of attractive towns like beautiful Castleconnell by the Shannon, Killmallock and its rich history or Adare. During the early centuries of the first millennium A.D., lands were allotted to the various Celtic clans of noble pedigree. The O'Deas became lords of that part of North West Clare between the river Fergus to the East, the Burren to the North, and the Atlantic ocean to the West.
Some believe Hugh de Dinant of Brittany that came to England with William the Conqueror was rewarded the manor of Harford in Devon is a possible source. Another source has speculated in his publication that John Du Mont of Kent England 1600 was a founding source. A Fishing Plantation, Marblehead, Massachusetts the "Old Dimond House" was settled as a fishing village in the first half of the 1600s. These were fishing camps for West Country men rather than experiments for devout East Anglicans. The two decades of war [Queen Anne’s War] before 1713 brought hard times to the Marblehead fishery. With peace in 1713 this reversed and local control began to develop.
Elizabeth I-James I. Other Anglicized Irish forms dated by Woulfe to late period show an apostrophe after the O in some bynames. Based on this information, we have changed this byname to O'Deay, based on the dated example O Deay found in Woulfe, in order to register this name. Woulfe, however, differentiates Dinneen and Dynan, giving O Daghnain as the original Irish form of the latter. In Irish the name is O Duinin, anglicized Downing. In Limerick: Dinaghane Dinahan Dinahine Dinan O Dinan Dinane Dineen Dinehan O' DINEHAN Dingavan Dinighan O Dinnahan Dinnahane O' Dinneen: O'Dinan or Downing, chiefs of Uaithne, now the barony of Owneybeg, in Limerick, thus O'Dinan (Dinnahane) is cited as chiefs of Uaithne, as hereditary chiefs of the Eoghanacht Uaithne Agamar. O'Dea was documented from MacLysaght (p. 76), which lists O Dea. However, many of the Anglicized Irish forms listed by MacLysaght are modern. Woulfe (p. 494 s.n. {O'} Deaghaidh) lists O Dea as a modern Anglicized Irish form and lists the forms O Daa, O Dawe, O Daye, and O Deay as Anglicized Irish forms dated. O'Dea with variant spellings Day, Dea, Goodwin, O'Dea, O'Dee, Daw, is a county Clare name and is located for the most part in the barony of Inchiquin.
O' Dinan | Mumhain Chiefs of Éoganacht Uaithne Ageamar [Owney Agamar] or O'Duinechair (Dannaher) given as hereditary chiefs of Eoghanacht Uaithne Ageamar / Owney Agamar and O'Dinan / O'Dinnahan, Dinaghane, Dinahan, Dinahine, Dineen, Dinehan | Tipperary -Waterford, Thomond. Dinan is a distinct name, Ó Daghnáin in Irish. Deenihan anglicized forms of Ó Duinneachin. O'Dinan or Downing, chiefs of Uaithne, now the barony of Owneybeg, in Limerick. From 11th-16th century in Tipperary.