Guillermina is a distinctive girls' name in United States, ranking #10319 in 2008 with 11 recorded births. The name reached its all-time peak in 1999 with 24 births ranking #4631. Since 1996, the popularity has decreased by 45.0%. In 2008, approximately 1 in every 171,883 girls born was named Guillermina. FALLING Recent data shows the name is currently falling.