Anglicized form of Welsh 'Dewi,' the Welsh form of David, meaning beloved.
Dewey is an Anglicized form of the Welsh name Dewi, itself a Welsh contraction of the Latin Davidus — David. David, from the Hebrew Dod or Dodavehu, means 'beloved' and is among the most important names in the Abrahamic traditions, belonging to the great king and psalmist of the Hebrew Bible. Dewi is the patron saint of Wales (Saint David, c.
500–589 CE), and his feast day on March 1st is a national celebration. The anglicized Dewey brought this Welsh heritage into English-speaking use, particularly in communities of Welsh descent in England and America, where it flourished as both a surname and a given name through the nineteenth century. In American history, the name Dewey is associated most strongly with two figures of the late nineteenth and early twentieth centuries: Admiral George Dewey (1837–1917), the naval hero of the Battle of Manila Bay during the Spanish-American War in 1898, whose popularity was so enormous that the name became a national craze almost overnight; and Melvil Dewey (1851–1931), the librarian who invented the Dewey Decimal System in 1876, which organized public libraries across the English-speaking world and remains in widespread use today.
A third Thomas E. Dewey was the two-time Republican presidential candidate famously — and incorrectly — declared the winner over Harry Truman in 1948, producing one of history's most iconic newspaper headlines. Dewey peaked as a given name in the early twentieth century, riding the wave of Admiral Dewey's fame, and gradually receded into the charming vintage tier it now occupies.
It fits comfortably with the contemporary revival of old-fashioned American names — Clarence, Earl, Clyde — that feel warm, unpretentious, and genuinely historical. It also has the advantage of a soft, approachable sound that ages well from childhood into adulthood.