Guillermina is a distinctive girls' name in United States, ranking #6724 in 2001 with 16 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 20.0%. In 2001, approximately 1 in every 112,535 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.