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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, William, 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, Vilhelm, Vilem, Viliam, Vasili, Vasily, Uilleam, Uilliam, William

Last name origin & meaning:

Spanish: from the personal name Guillermo, Spanish equivalent of William.