Guillermina is a distinctive girls' name in United States, ranking #6276 in 1997 with 15 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 25.0%. In 1997, approximately 1 in every 116,044 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.