Earl of Arran is a title in the Peerage of Ireland. It is not to be confused with the title Earl of Arran in the Peerage of Scotland. The two titles refer to different places: the Aran Islands in Ireland, and the Isle of Arran in Scotland. The Irish earldom is held by the Gore family. The Scottish earldom is a separate title, held as a subsidiary title of the Duke of Hamilton.

Baron Harlech, of Harlech in the County of Merioneth, is a title in the Peerage of the United Kingdom. It was created in 1876 for the Conservative politician John Ormsby-Gore, with remainder to his younger brother William. He had previously represented Carnarvon and North Shropshire in the House of Commons. Ormsby-Gore was the eldest son of William Ormsby-Gore, Member of Parliament for County Leitrim, Carnarvon and North Shropshire, and the great-great-great-grandson of William Gore, third and youngest son of Sir Arthur Gore, 1st Baronet, of Newtown, second son of Sir Paul Gore, 1st Baronet, of Magharabag, whose eldest son Paul was the grandfather of Arthur Gore, 1st Earl of Arran.