Guillermina is a distinctive girls' name in United States, ranking #8043 in 2005 with 14 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 30.0%. In 2005, approximately 1 in every 131,978 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.