Guillermo is a ♂ boy’s name.
Guillermo is a Spanish form of the name William, which derived from the Germanic name Wilhelm.
Guillermo means “resolute protector” (from Old High German “willio” = will/desire + “helm” = protection/helmet).
Based on the frequency of positive ratings, we can analyze how popular names are in different countries. The name Guillermo is currently ranked #8539 on the name leaderboard.
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