The older spelling was Ó Laoghaire but is modernized as Ó Laoire.
James O'Leary (Séamas Ó Laoire)
Nora O'Leary (Nóra Ní Laoire, maiden name)
Bridget O'Leary (Bríd Uí Laoire, married name)
The closest Gaelic name is Aidan, spelled Aodhán in Irish Gaelicand Aodhan in Scottish Gaelic.
It is not a Gaelic name and has no meaning in Gaelic. In the Irish language Bible it is spelled Iárad FWIW.
The name 'Herbert' is spelled Hoireabard in the Irish.
It is a surname originating from Britain and Ireland
Even with the last name in a 'Gaelic' form Irene was spelled as in English.
In Irish it is spelled Séamus/Séamas and it is the Irish for 'James';in Scottish Gaelic it is spelled Seumas, also 'James'.James is a form of Jacob ('he who takes by the heel or overreaches'in Hebrew).
Brian is spelled the same in Irish and Scottish Gaelic; Brian (pronounced breeun). Unless 'Good' is a native Irish name that has been anglicized, it would be spelled 'Good'.
If you mean as a feminine first name, it's still spelled Erin, even if the last name is in an Irish Gaelic spelling.
It's not an Irish name so it has no meaning in Irish.
Scottish: Calum the Irish equivalent is Colm (pronounced kullum).
The name Caitlín is a girl's name in Irish first anglicized as Kathleen.It is not 'kate-lynn' in Ireland but more like 'catch-leen'.
It's a Welsh name Megan a form of Margaret;Irish would use Peig or Peigín.Scottish Gaelic is Magaidh or Peigi.Although Megan/Meghan may sound Irish, it isn't.