From an English place name meaning Hroda's island, associated with Admiral Rodney.
Rodney is generally understood as an English surname-name that became a given name, probably derived from a place-name meaning something like “Hroda’s island” or “the clearing/island of Roda,” with Old English elements behind it. Like many English surnames turned first names, Rodney carries traces of landscape and settlement history: a personal name combined with a topographical term. Its exact early path is less transparent than that of names rooted in saints or scripture, but its sound and structure clearly place it in the long English naming tradition where places, estates, and family lines eventually became personal names.
Rodney gained prestige in part through Admiral George Rodney, the eighteenth-century British naval commander associated with victories during the era of empire. That association gave the name a martial, establishment flavor in Britain, while in the United States it later became simply a familiar mid-century masculine given name. By the twentieth century Rodney could feel brisk, polished, and slightly preppy, though popular culture also reshaped it: comedian Rodney Dangerfield made it inseparable for many from self-deprecating humor and the famous refrain about getting “no respect.”
As fashions changed, Rodney faded from the top ranks and began to sound more tied to an earlier generation. Even so, it remains a good example of how English surname-names travel through social meanings: from place-name to family name, from public honor to everyday use, from patrician formality to pop-cultural familiarity.