The Ó as in Ó Briain (O'Brien) comes from the older Irish word Ua (grandson, grandchild; descendant).
The prefix O' seen in Irish surnames is from the Irish (Gaelic) Ó (earlier Ua)which means 'grandson, descendant'.O'Neill in Irish is Ó Néill (descendant of Niall).Grandson or descendant.
It has been estimated that 80% of Irish surnames originally had an O' prefix.
O' in Irish surnames is from Ó (grandson,descendant) as in Ó Néill, grandson of Niall or Ó Briain from Brian, etc.
There are various beliefs into the origins of the Mullinsand Mullens surnames. The Irish belief is that it may be the Anglicisation of the Irish name O Maolain, from a diminutive of maol, meaning 'bald' or 'tonsured', which arose separately in a number of areas.
It is estimated that about 20% of Irish surnames have a Mac prefix. Mac means son; so Mac Carthaigh would mean 'son of Carthach'.
The surname Colton is spelled Coltún in Irish (Irish Names and Surnames, Woulfe).
Are you asking about Christian (first) names or Surnames? For surnames the prefix O' meaning grandson (of) also Mc/Mac meaning son (of) which is prevalant in the Highlands of Scotland as well. The two acounting for 25% of the top 100 most common surnames in Ireland.
In Ireland Justin is used even with Irish Gaelic surnames.
the "O" in Irish means son of as in O'Brien is son of Brien
It's either a typo or s/he works for Apple. It may mean that that a letter is missing; female Irish surnames begin with "ní" before the main name,meaning daughter of.
The clan of Farrell or O Farrell comes from Country Longford in The Irish Republic
Derived from patronomycs - Mac or Mc means son (of), similar in use to the Irish O which originally meant grandson (of) and Mac was also used in Ireland but largely died out leaving Mac/Mc surnames generally Scottish and O' surnames generally Irish. The MAc/Mc names are generally Highland surnames but not always so, Lowlander and Norse descendants also used this titling to some extent. Nic means daughter but the usage has not fed into surnames in the same way as Mac/Mc. Mac is still used in Ireland and has not died out. So Mac is not generally Scottish an example is McNamara and McNamee. It is still a common prefix in Irish names.