Armstrong is a surname of Scottish borders origin. It derives from a Middle English nickname which meant someone with strong arms. In Ireland the name was adopted as an Anglicization of two Gaelic names from Ulster: Mac Thréinfhir (meaning "son of the strong man") and Ó Labhraidh Tréan (meaning "strong O'Lavery"). Clan Armstrong is a clan from the border area between England and Scotland. The Scottish Armstrong is reputed to have been originally bestowed by "an antient (sic) king of Scotland" upon "Fairbairn, his armour-bearer" following an act of strength in battle. In the UK this surname is well represented in North East England, Cumbria, Lancashire, Yorkshire, Scottish Borders, Lanarkshire, Ayrshire, Dumfries & Galloway, and Northern Ireland, and in the US it is well represented in the Deep south, and other southern states. From the name Ó Labhraidh Tréan (meaning "strong O'Lavery" and sometimes written in AngloIrish as "Tréanlámagh") the following surnames survive: "Trainor", Traynor", O'Lavery", "McLavery", and "MacLavery". Although the name "Armstrong" is quite common in the Aghagallon and Glenavy area of County Antrim in Northern Ireland, the other names are to be found within the 9 Ulster Counties and Scotland, especially along the west coast.