Guillermina is a distinctive girls' name in United States, ranking #17397 in 2015 with 5 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 75.0%. In 2015, approximately 1 in every 356,931 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.