Short form of Robert, from Germanic 'hrod-berht' meaning 'bright fame.'
Rob stands as one of the most durable short forms in the English-speaking world, a crisp distillation of Robert — itself descended from the Old High German "Hrodebert," a compound of "hrod" (fame, glory) and "beraht" (bright). The Normans carried the name into England after 1066, and within two centuries Robert had become one of the most common masculine names in Britain, generating a whole ecosystem of diminutives: Bob, Bobby, Robin, and the clean monosyllabic Rob. The name's most romantically charged bearer is undoubtedly Rob Roy MacGregor, the Scottish folk hero and outlaw of the early eighteenth century, whose life of clan loyalty and cattle raiding was immortalized first by Daniel Defoe and later by Sir Walter Scott.
Rob Roy became Scotland's Robin Hood — a figure of populist defiance whose name carried a specific Highland roughness and romance. The cocktail named in his honor, a Scotch whisky Manhattan, carries that rugged elegance into the present day. Literary culture has also given us Robert Browning and his wife Elizabeth Barrett, whose love letters remain among the most celebrated in the English language.
As a standalone given name rather than a nickname, Rob acquired greater independence in the twentieth century, particularly in Britain and Australia, where clipped, no-nonsense names have always found favor. Actors Rob Lowe and Rob Reiner helped cement its modern, affable image. Rob occupies a particular cultural register: friendly, unpretentious, and confident without being flashy — a name that wears its long history lightly.