The name Guillermo means With Gilded Helmet and is of Spanish origin. Guillermo is a name that's been used primarily by parents who are considering baby names for boys.
A form of William. Pronounced "gee-YEHR-mo" with a hard G.
Baby Names Tip: Say your potential baby name aloud. Introduce yourself as your baby with first and last name. How does it sound? The cadence and rhythm of a name is just as important as its spelling.