Guillaume meaning, boyGuillaume

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What does Guillaume mean?

Guillaume \gu(i)-llau-me\ as a boys' name is pronounced gee-OHM. It is of Old German origin, and the meaning of Guillaume is "determined protector". French variant of William. Guillermo (gui-YARE-mo) is a Latin form. French poet Guillaume Apollinaire.


Guillaume has 6 variants: Gillermo, Guglielmo, Guilherme, Guillermo, Gwillyn and Gwilym.

Guillaume has 31 more alternative forms via William: Bill, Bille, Billie, Billy, Liam, Vilhelm, Villem, Wilek, Wiley, Wilhelm, Wilhelmus, Wilkes, Wilkie, Wilkinson, Will, Willem, Willhelmus, Willi, Williams, Williamson, Willie, Willis, Willkie, Wills, Willson, Willy, Wilmer, Wilmot, Wilmott, Wilson and Wim.


Guillaume is a rare given name for men but a very popular last name for both adults and children (#11719 out of 150436, Top 8%). (2000 U.S. Census)

Bill, Billie, Billy (#794 in 2014), Guillermo (#678), Liam (#2), Wiley, Wilhelm, Will (#763), William (#5), Williams, Willie (#722), Willis, Willy, Wilmer and Wilson (#594) are the popular alternative forms of Guillaume (#unlisted). Usage of these boy names reached its peak during 1920-1929 (usage of 0.5873%) and is now much lower (usage 0.2295%, down 60.9%), with versions such as Billy, Guillermo, Will, Willie and Wilson falling out of fashion. Liam (#2) is the most trendy boy name in this list. Below is a graphed analysis of the usage of Guillaume and corresponding names. (Top 1000 Baby Names Records, 2014)

Top 1000 baby names ranking of Bill, Billie, Billy, Guillermo, Liam, Wiley, Wilhelm, Will, William, Williams in U.S.

Top 1000 baby names ranking of Willie, Willis, Willy, Wilmer, Wilson in U.S.

Top 100 baby names ranking of Billy, Liam, Wilhelm, Will, William, Wilmer outside U.S.