It is also the patronymic form of the Irish name Reilly Irish Gaelic.

Where did the o come from in irish names. Aileen f Scottish Irish English. It is hardly necessary to state that these prefixes denote descent mac son indicating that the surname was formed from the personal names or sometimes calling of the father of the first man to bear that surname while O names are derived from a grandfather or even earlier ancestor o or ua being the Irish word for grandson or more loosely male descendant. O grandson Irish McMac son Irish For completeness when written in Irish there are female versions and derivatives of both Mac and Ó.

Many Irish surnames have a O in front in their Irish version this list is mainly confined to those names where the O is commonly used in the English version of the name. The Irish used a very particular naming pattern for children for about two centuries beginning in the late 1700s and going through the early to mid-1900s. Back to Irish surnames It comes from the old Gaelic name OCaiside.

One of the oldest surnames in Ireland the O Clery surname anglicized to Clarke is most prevalent in Cavan. The earliest recorded surname is Ó Cléirigh. It was originally map the equivalent of the Gaelic peoples Mac Mc mic but dropped the m.

A list of Irish surnames beginning with the letter O. With Irish names it is somewhat different. There are now four O names in the Irish.

Mac surnames are generally of a much later date than Ó. OReilly is ranked tenth in the top twenty list of most common Irish surnames. It is likely derived from the word cobhthach meaning victorious.

The Queen of England is descended from the OBriens. 2 The name is commonly found throughout Ireland with the greatest concentration of the surname found in County Cavan followed by Longford Meath Westmeath Fermanagh and Monaghan and the Province of Leinster. The name OCaiside was made up of two separate parts.