It's originally a surname (last name). The Irish spelling is "Ó Giollagáin," which is a diminuative of the word "giolla" meaning "lad, youth, page, attendant, servant" so "Giollagáin" means "little boy" or "laddie."
It has no meaning in Irish; it's not an Irish Gaelic name.
It is not a Gaelic name and has no meaning in Gaelic. In the Irish language Bible it is spelled Iárad FWIW.
It is of Irish and Gaelic origin. Poetic name for Ireland.
The Scottish Gaelic form of the surname is MacIllFhionndaig.As a first name it would be Liondsaidh.(Some Irish families that adopted the name 'Lindsay' were MacClintock, Lynchy, and O'Lynn.)
The Irish Gaelic name Mac Óda is derived from their ancestor Odo Archdeacon.
Niall is the Irish Gaelic form
Belfast is Béal Feirste in the Irish. It mean 'Mouth of the River Fearsad'.
The word for "name" is ainm in Irish (Gaelic);In (Scots) Gaelic it's also ainm.('Surname' is sloinne in Irish; sloinneadh in Scottish Gaelic.)
The name Ciaran is of Gaelic orgin, and it mean "black" or "little dark one". It is an Irish name.
Eithne is an Irish (Gaelic) name which one source translates as 'kernel'.
It is an English name and most likely has no Irish Gaelic form.
No Irish equivalent.