In Irish it's tríníní (triplet children) / tríréad (in music)
Triúr chara (pronounced: truer cora)
Another answer:
Triúr chairde (in Conamara) (trioor khardjih)
An Trianaid
It doesn't look like a Gaelic word.
croí
It seems to be a Hebrew word.
The Irish word for 'story' is 'scéal' and the Scottish Gaelic is 'sgeulachd'.
marbhan That is Gaelic for "Corpse" not "Copse"
bìdeach
It doesn't look like Scottish Gaelic.
In Irish it's "fiosracht"
In Irish it's "neamhspleáchas"
In Irish it's "drabhlás"
In Irish it's "baile"
It's not in Gaelic or any other Celtic language.