Guillermina is a distinctive girls' name in United States, ranking #15631 in 2012 with 6 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 70.0%. In 2012, approximately 1 in every 293,457 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.