AIUI, if you go by Irish law, the non-UK part of the island is just "Ireland"[1], and the island as a whole can be referred to as the "island of Ireland". The "

AIUI, if you go by Irish law, the non-UK part of the island is just "Ireland"[1], and the island as a whole can be referred to as the "island of Ireland". The "Republic of Ireland" is the description of the state of Ireland[2]. In the UK, "Ireland" can mean either the country or the island as a whole. It's often clear from the context which is meant, though "Republic of Ireland"/"Irish Republic" is frequently used instead to make the distinction obvious. The Good Friday Agreement[3] recognises that the people of Northern Ireland may consider themselves British, Irish, or both: > recognise the birthright of all the people of Northern Ireland to identify themselves and be accepted as Irish or British, or both, as they may so choose, and accordingly confirm that their right to hold both British and Irish citizenship is accepted by both Governments [1] Constitution of Ireland, Article 4: "The name of the State is Éire, or, in the English language, Ireland." https://www.irishstatutebook.ie/eli/cons/en/html#part1 https://www.irishstatutebook.ie/eli/cons/en/html#part1 [2] The Republic of Ireland Act, 1948, section 2: "It is hereby declared that the description of the State shall be the Republic of Ireland." https://www.irishstatutebook.ie/eli/1948/act/22/section/2/enacted/en/index.html https://www.irishstatutebook.ie/eli/1948/act/22/section/2/en... [3] https://peacemaker.un.org/sites/peacemaker.un.org/files/IE%20GB_980410_Northern%20Ireland%20Agreement.pdf https://peacemaker.un.org/sites/peacemaker.un.org/files/IE%2...