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First name origins & meanings:

1. Spanish: Resolute, protector
2. Teutonic: Valiant protector

First name variations: Guillaume, Guilherme, Gillermo, Gughilmo, Gwillyn, Gwilym, Guillermo, Wil, Will, Willem, Wilhelm, Wilmos, Wilmot, Wilson, Williams, Williamson, Wills, Willie, Willy, Wiley, Wyley, Wilkie, Willkie, Wilkes, Wylkes, Willis, Wilton, Wilmer, Wilmar, Winton, Willard, Wilford, Guillaume, Guillermo, Vilhelm, Vilem, Viliam, Vasili, Vasily, Uilleam, Uilliam

Last name origin & meaning:

English: from the Norman form of an Old French personal name composed of the Germanic elements wil ‘will’, ‘desire’ + helm ‘helmet’, ‘protection’. This was introduced into England at the time of the Conquest, and within a very short period it became the most popular personal name in England, mainly no doubt in honor of the Conqueror himself.

Famous people with this first name: William Shatner

Famous people who gave their babies this name: Kirstie Alley, Lindsay Buckingham, Billy Crudup, John O'Hurley, Mary-Louise Parker, Charles - Prince of England, Diana - Princess of England

This name appears in the following lists: Black History/Civil Rights Leaders, Heroes and Heroines, Artists, Names from Shakespeare, Poets, Opera Singers, Pioneers/Explorers, Presidents' Kids, Silver Screen, U.S. Presidents