More common Irish expressions might be:
Go n-éirí do bhóthar leat; Go dtéidh tú slán; Go soirbhí Dia dhuit. (these are all to one person).
[guh ny-ree dhu wóhur lath] [guh djae thoo slawn][guh serivee djeea ghitch] pronounced as in Galway.
god
In Irish Gaelic it was usual to say Dia linn or "God with-us".
Dia
Go mbeannaí Dia anseo isteach!
It's a euphemism for 'By God' and it not from Irish Gaelic.
In Irish Gaelic: Moladh le Dia In Scottish Gaelic:
It's not Irish Gaelic; it's a euphemism for 'by God'.
For the record, "Gaelic" is used for the Scottish variety, and the Irish is called "Irish" at least in Ireland.That having been said:Mo dheartháir is the Irish andmo bhràthair is the Gaelic (Scotland).
In Irish it's "Dia"
Dia duit
Faux Irish Gaelic.
You need to specify Irish Gaelic or Scottish Gaelic: they are two separate languages.