MacChruim is a Scottish surname of Gaelic origin. It means "son of Crum", where Crum is a Gaelic byname meaning "bent" — possibly referring to a physical characteristic such as a stoop or crooked posture. The name belongs to the common Scottish and Irish patronymic tradition using the prefix Mac- (meaning "son of"). MacChruim has several Anglicized variants: MacCrum, MacCrumb, and McCrum. The Ch in the original Gaelic spelling represents the voiceless velar fricative sound, often lost or softened in Anglicized forms. The surname is chiefly found in Scotland and in areas of Scottish diaspora, with a distribution that likely reflects the historic movements of Gaelic-speaking populations. Due to the rarity of the name, exact historical bearers are poorly recorded, but genealogical records occasionally mention the MacCrum and McCrum spellings in Scottish parish registers. As with many Mac- surnames, MacChruim would have originated as a descriptive identifier, distinguishing a family by their relationship to a founder or ancestor nicknamed Crum ("bent"). In Gaelic naming conventions, the byname Crum could also signify "humped" or "crooked," a survival from Old Irish cromm. While not a common surname today, its variants persist in Scotland, Northern Ireland, and among Scottish emigrant communities. Meaning: "Son of Crum (the bent)" Origin: Gaelic Scottish Type: Patronymic surname Usage regions: Scotland, Northern Ireland, Scottish diaspora Variants: MacCrum, MacCrumb, McCrum