Guillermo is a common Spanish name derived from the Germanic name Wilhelm, meaning "resolute protector." It is widely used in Spanish-speaking countries and can be found in various cultures, often associated with notable figures in history, literature, and entertainment. In popular culture, Guillermo may refer to characters in films or television shows, such as Guillermo del Toro, a renowned filmmaker known for his work in fantasy and horror genres. The name is also associated with various public figures, including athletes and politicians, contributing to its recognition and popularity.