Rees is an Anglicized form of the Welsh name Rhys, derived from the Old Welsh Ris, likely meaning "ardour" or "enthusiasm." The name historically belonged to several Welsh rulers, most notably the 12th-century Rhys ap Gruffydd, a prince who resisted Norman invasion. Rees is also a variant spelling alongside Reece and Reese, which are more common in English-speaking countries.Notable BearersThough less famous than its root, Rees appears as a surname derived from the same source. Notable Welsh figures include several bearers in politics, sports, and academia. In Germany, the name also refers to a town in North Rhine-Westphalia, but this is unrelated etymologically.Distribution and UsageAs a given name, Rees is rare and primarily used in Wales and among the Welsh diaspora. It has masculine usage, though surnames like Reese have been adopted unisexually in countries such as the United States.Meaning: "ardour" or "enthusiasm" (via Rhys)Origin: Old Welsh RisType: First name (also surname) Usage Regions: Wales, English-speaking world