Guillaume, of Germanic origin, translates to "helmet" or "protection," signifying strength and fortitude. Popularized during medieval times, it was borne by several French nobles, including William the Conqueror. The name reached its peak popularity in France between the 13th and 16th centuries but remains widely recognized today.
The name Guillaume experienced significant fluctuations in popularity over the years, with a notable peak in the early to mid-1990s and a decline towards the late 2000s and early 2010s. The most popular years for the name were 1987 (10 births), 1988 (11 births), and 1992 (15 births).