From the Scottish Borders town Kelso, meaning chalk ridge from Old English.
Kelso is a Scottish place name turned surname turned given name, with a journey that begins in the Border country of southern Scotland. The town of Kelso in Roxburghshire takes its name from the Old English *calc-hoh*, meaning "chalk spur" or "chalk ridge" — a reference to the chalky limestone topography of the area where the rivers Tweed and Teviot meet. The town was home to Kelso Abbey, one of the great Border abbeys founded by King David I in the 12th century, and the name carried the prestige of that ecclesiastical and trading history as it became a hereditary surname in the region.
As a given name, Kelso has been used sporadically in Scotland and among Scottish diaspora communities — particularly in the American South and Canada — where the surname tradition of using family names as given names has deep roots. It carries that particular quality of Scottish Border surnames: short, strong, consonant-rich, geographically grounded. It sounds related to Kelsey and Kelsey's relatives but sits apart from them, more decidedly masculine and more rooted in a specific landscape.
The name also reached wider cultural awareness through the character of Michael Kelso in the long-running American sitcom *That '70s Show* (1998–2006), played by Ashton Kutcher — a lovable, dim-witted charmer who made the name simultaneously more recognizable and more playful. For contemporary parents, Kelso occupies interesting territory: it is a genuine historical surname with Scottish roots, rare enough as a given name to feel fresh, and carries the rugged outdoor associations of the Scottish Borders. It pairs well with both traditional middle names and modern ones, aging gracefully from childhood through adulthood.