(male) Probably the most successful of all the Old French names of Germanic origin that were introduced to England by the Normans. It is derived from Germanic wil ‘will, desire’ + helm ‘helmet, protection’. The fact that it was borne by the Conqueror himself does not seem to have inhibited its favour with the ‘conquered’ population: in the first century after the Conquest it was the commonest male name of all, and not only among the Normans. In the later Middle Ages it was overtaken by John, but continued to run second to that name until the 20th century, when the picture became more fragmented.
Short forms: Will, Bill.
Pet forms: Willy, Willie, Billy.
Cognates: Irish: Uilliam. Scottish Gaelic: Uilleam. Welsh: Gwilym. German: Wilhelm. Dutch: Willem. Scandinavian: Vilhelm. French: Guillaume. Spanish: Guilermo. Catalan: Guillem. Portuguese: Guilherme. Italian: Guglielmo. Czech: Vilém. Slovenian: Viljem. Hungarian: Vilmos. Lithuanian: Vilhelmas. Latvian: Vilhelms.
English (of Welsh origin): Anglicized form of Welsh ap Hywel ‘son of Hywel’, a personal name meaning ‘eminent’ (see Howell).
Irish: mainly of Welsh origin as in 1 above, but sometimes a surname adopted as equivalent of Gaelic Mac Giolla Phóil ‘son of the servant of St. Paul’ (see Guilfoyle).
FOREBEARS This surname is extremely common in Wales and has also spread throughout England and Ireland. The first recorded occurrence of the surname in its modern form is Roger ap Howell, alias Powell, named in a lawsuit in 1563. He was the grandson of Howell ap John (d. 1535). Snelling Powell, born in Carmarthen, Wales, in 1758, came to America in 1793 and was a successful actor and theater manager in Boston. Later members of the family include the novelist Anthony Powell (b. 1905).