Giermo
This is a Spanish variation of the Old High German "Willehelm," which means "resolute protector."
Alternates:
Gigermo, Gijermo, Gillermo, Gillirmo, Giyermo, Guermillo, Guiermo, Guilermón, Guillelmo, Guillermino, Guillermo, Guirmo, Gullermo, Quillermo
More info:
Results for "Giermo" on Google