Meaning & Origin
a female given name, equivalent to English Wilhelmina
Guillermina is a girl's baby name of Spanish origin, the Spanish feminine form of Guillermo (the Spanish form of William), from the Germanic Wilhelm, meaning 'resolute protector' (from wil — will/desire + helm — helmet/protection).
Guillermina is a traditional, formal Spanish name that carries dignified weight in Latin American and Spanish cultures. Long and melodic, it is often shortened to Mina, Guille, or Willi in everyday use. It suits families who want to honor Germanic heritage through the Spanish linguistic tradition.