Wiktionary
n. (surname Scottish patronymic from=given names)
Wikipedia
Aitchison is a Scottish surname of Scots origin. It derives from the pet name Atkin, which is a diminutive of Adam.
Another variant of the name is Acheson. It corresponds to the English name Atkinson, which is particularly common in Northern England. At the time of the British Census of 1881, the relative frequency of the name Aitcheson was highest in Berwickshire (174.6 times the British average), followed by Haddingtonshire, Roxburghshire, Selkirkshire, Peeblesshire, Dumfriesshire, Edinburghshire, Linlithgowshire, Northumberland and Lanarkshire. The Aitchisons are traditionally a mainly Borders and Lowlands family. They are considered to be a sept of Clan Gordon
In Ireland, the name is common only in Ulster and particularly in counties Antrim and Down. Some Aitchisons are descended from Planters, although the name was recorded in Ireland before that period.
Acheson is a variation of the name in Scotland and the Border region, having been originally spelled Atzinson (with the 'z' being pronounced as 'y', as in yet).
Usage examples of "aitchison".
Maybe he would be soon, if Scully Aitchison MSP got his way, but for now Joey had a bedsit and a trickle of state cash.
There was a small photo of Aitchison, too, beaming that self-satisfied smile, his glasses glinting.