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Guillaume is a masculine given name of Germanic origin. It comes from will "will" and helm "helm, helmet, protection." It is a form of oïl corresponding to the Occitan Guilhem, the Catalan Guillem, the English William (Old Norman), and the German Wilhelm. The figure who gave rise to the name's popularity is the Count of Toulouse Guilhem or Saint Guilhem of Gellone, grandson of Charles Martel and first cousin of Charlemagne. He was the model of the generous and intrepid knight. In Paris, William of Bourges tended to supplant him because the Sorbonne chose him as its patron saint. Anyway. Who cares. Thanks, Wikipedia.