Scottish form of Alexander, from Greek Alexandros meaning 'defender of the people'.
Alastair is the traditional Scottish Gaelic form of Alexander, itself derived from the ancient Greek Aléxandros — a compound of 'alexein' (to defend) and 'aner/andros' (man), yielding the meaning 'defender of men.' The name traveled from Greek into Latin and then into the Celtic languages of Scotland and Ireland, where it was transformed phonetically and orthographically into Alasdair, Alastair, and Alistair — variant spellings that all represent the same Gaelic adaptation. Alexander the Great's legendary conquests in the fourth century BCE made the name one of the most prestigious in the ancient world, and it spread across continents with his armies, taking root wherever Greek influence reached.
In Scotland, the name became deeply embedded in Highland clan culture. Numerous Scottish kings, clan chiefs, and chieftains bore the name, and it appears throughout Scottish literature and history. In the twentieth century, Alistair Cooke became one of the most celebrated transatlantic broadcasters, his forty-two-year Letter from America series on the BBC making the name synonymous with elegant, unhurried storytelling.
Alastair Campbell served as director of communications for Prime Minister Tony Blair, adding a different kind of contemporary profile to the name. In literature, Alistair MacLean thrilled millions with adventure novels like 'The Guns of Navarone.' The Alastair spelling — with its 'ai' and the distinctive second 'a' — is considered the more traditional Gaelic rendering, carrying a stronger Scottish Highland identity than the more widespread 'Alistair.'
In modern usage outside Scotland, Alastair conveys a particular kind of assured, literary Britishness — thoughtful, slightly bookish, quietly confident. It ages exceptionally well, projecting maturity at every stage of life, and its Highland roots give it a romantic, windswept quality that softer names lack.