Guillermina first appears in the U.S. registration record in 1918. Its popularity climbed over the following decades. In 1966, 40 babies received the name (ranked #1806). Today it sits well outside the top 1,000 (around #14016), with roughly 7 babies named Guillermina each year. Guillermina's usage has held roughly steady recently. In total, around 1,924 babies have been registered with this name since 1880.