Why not learn the national Anthem in Irish. You too will then be able to sing along with it at Championship matches when it is sung.
Sinne-ne Fianna Fáil
Atá fé gheall as Eirinn,
Buionn dár slua,
Thar tuinn do ráinig chugainn
Fee mhóid bheith saor,
Sean- Tir ar sinnsear feasta
Ni fágtar féin tiorán ne féin tráil,
Anocht a théim sa bhearna baoil,
Le gean ar Ghaedhil chun báin no saoil,
Le guna scréach fé leamhach na Bhiléar
Seo libh canaidh amhrán na bhFiann