From Ó Duinn or Ó Doinn, 'descendant of Donn (brown)'.
'Onsager' is not an Irish word; it is a Norwegian surname.
It doesn't mean anything in Irish; it's a Spanish surname (son of Rodrigo).
The proud and noble Irish surname of Flynn means "ruddy".
Irish surname meaning 'dark warrior'. Ó Dubhlaoich
Ketcham is not an Irish word. It's an English surname from Surrey.
It has no meaning in Irish; it is the surname of a family of Welsh origin in Ireland.
It may derive from the Irish surname Ó Caoilte which means 'descendant of Caoilte' (thought to mean 'hard').
If you mean the Irish surname, Ó Maonaigh.
The proud and noble Irish surname of Kehoe originated in the Gaelic language as the Irish given name, or personal name, meaning a "horseman". The surname is first found amidst the early records of Tipperary.
Kennelly comes from the Irish origin and means surname.
No, it is not of Irish origin. It is mostly an English surname, but occassionally a Scottish surname as well.
It can be used in front of a surname to indicate "wife of". If a woman name Máire was married to a man whose surname was Kelly, in Irish "Máire Ui Ceallaigh" would mean Máire the wife of Kelly.