In Irish Gaelic An t-ádh dearg is 'the luck of the
The word 'luck' is in English not Irish Gaelic.
In Irish: ádh or seans. In (Scottish) Gaelic: ?
"Gaelic" can mean "Irish Gaelic' or "Scottish Gaelic". They are classified as two distinct languages.
It would be 'Bhí an t-ádh dearg orainn' in Irish.
ádh (pronounced 'aw')
In Irish it is Bhí an t-ádh dearg ort.
In Irish it's "dheamhan mí-ádh"
Scottish Gaelic: Beir buaidh! (best of luck, I hope you succeed!) Irish Gaelic: Go n-éirí go geal leis. (The best of luck to him.)
ádh (m1) - (good luck to you is - ádh mór ort!)
Both Irish and Scottish Gaelic are derived from Old Irish but are considered separate languages today. Some refer to Irish as 'Gaelic' especially overseas. For clarity they can be called 'Irish Gaelic' and 'Scottish Gaelic'.
Go raibh an t-ádh dearg oraibh.(plural)
Go raibh an t-ádh dearg ort (oraibh, plural).
Scottish Gaelic, Irish Gaelic, and Manx all derive from Old Irish.
In Irish it's "ádh an" or "ádh na" (followed by the genitive).
In Irish it's saibhreas (money/wealth), ádh (luck)