Irish English (not Irish)
Clarifying some confusing points:
Irish belongs to the Celtic group of Indo-European languages. The Celtic group (yellow areas) includes Breton, Welsh, Irish, Scots Gaelic and Manx.
Irish English, or English belongs to the Germanic group of Indo-European languages. The Germanic group includes Icelandic, Danish, Swedish, German, Dutch, Flemish and English.
(Spanish belong to the Italic group of Indo-European languages. The Italic group includes Romance languages which come from Vulgar Latin, the spoken form of Classical Latin, the literary form. The chief Romance languages are French, Italian, Spanish, Catalan, Portuguese and Rumanian.)
Ireland or Eire is a country, where people speak Irish English. Check this out to hear its very own sounds: How to do an Irish accent in English (an actor explains how to sound Irish). Compare to what Irish (Gaelic) sounds like in connected speech: Irish
Northern Ireland is part of the United Kingdom or UK.
Unlike US American English and Canadian English, Ireland does not have its own spelling rules. British English spelling is used throughout the island.
Check out Literature - Writers - Oscar Wilde