Murphy
It is an Irish surname derived from the Irish Gaelic Ó hIcí (descendant of the healer or physician). Numerous in Tipperary-Clare-Limerick.
Irish surname meaning 'dark warrior'. Ó Dubhlaoich
In Irish ,Ó Ceallaigh (Kelly)ban-ghaiscíoch / banlaoch
The name Quinn is an Irish surname. In Irish is is Ó Cuinn - meaning a descendant of Conn.
It may derive from the Irish surname Ó Caoilte which means 'descendant of Caoilte' (thought to mean 'hard').
The name Hogan is of Irish origin meaning 'Descendant of the Young Warrior.'
From Ó Duinn or Ó Doinn, 'descendant of Donn (brown)'.
The Irish surname Sharkey is derived from Ó Searcaigh(descendant of Searcach,'loving' or 'beloved' according to some.
There's actually no such language as "Celtic". Celtic refers to a group of dozens of languages, six of which are spoken today:BretonCornishIrish GaelicManxScottish GaelicWelsh
Irish: reduced Anglicized form of Gaelic Ó Flannagáin 'descendant of Flannagán'
It derives from the Irish Gaelic Ó Conchúir (descendant of Conchúr, wolf-lover).
The surname Casey is Irish. It is the shortened Anglicized form of Gaelic Ó Cathasaigh 'descendant of Cathasach', meaning 'vigilant' or 'noisy'.