I think it is used in English; the Irish Gaelic word for 'dad' is daid.
It is pronounced colleen, but the Irish language word is spelt cailín. The Irish word for boy is buachaill, which is pronounced boo-kill. English is the main language spoken in Ireland.
younger = beag (in southern Ireland it's pronounced "beeyug")
The word for 'a hill' in Irish is 'cnoc' pronounced 'kun-uk' in SW Ireland, and 'kruk' elsewhere.
The Irish word for welcome is Fáilte, pronounced "fault cha".
Éire is Irish Gaelic for Ireland and it's pronounced AIR-ih.
In the Irish language, the word for island is "Oileán", which is pronounced 'ill-awn'. Also "Inis" pronounced 'inish".
The Irish word for 'father (athair) is pronounced as a-hir.
The usual word in Irish for 'music' is 'ceol', which is pronounced in SW and W Ireland as 'k-yól'. In the N it's pronounced more like 'k-yawl'.In Scotland, it is pronounced similarly to the N Irish.
English is the main language in Ireland, so people in Ireland just say "Christmas". In the Irish language the word for Christmas is "Nollaig", pronounced "Nullig".
The Irish word "Bean", meaning woman, is pronounced "ban".
People in Ireland speak English so you would just say "Peace". In the Irish language the word is "Síochán", which is pronounced Shee-kawn.