Likely an English-style place name built from elements meaning 'spring' or 'hill valley.'
Keldon carries the quiet authority of Anglo-Saxon place-name tradition. Like many English surnames-turned-given-names, it is believed to draw on Old English elements: kel or col (meaning cold, or possibly a cold stream) combined with dun or don (a hill, a fortified rise, or an elevated settlement). The resulting compound suggests a place perched on a cold hill — the kind of windswept northern English geography that gave the landscape its most evocative names.
Similar constructions produced Sheldon, Weldon, and Kelton, all of which share Keldon's sturdy, landscape-rooted character. As a personal name, Keldon belongs to a long tradition of place-names migrating first into English family surnames and then forward into given names — a pattern especially common in American and Scottish naming culture from the 19th century onward. It never achieved the mass popularity of its relatives Sheldon or Brandon, which gives it a quality of quiet rarity: recognizably English in its bones, yet distinctly uncommon in the wild.
In contemporary use, Keldon appeals to parents who want a strong, one-word masculine name with historical roots but without the saturation of more familiar choices. Its two syllables land with a clean firmness, and the internal "l" gives it a slightly soft landing that prevents it from sounding harsh. It is the kind of name that wears well across a lifetime — equally at home on a child's baseball cap and an adult's professional correspondence.