Guilherme is a distinctive boys' name in United States, ranking #5365 in 2003 with 14 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 100.0%. In 2003, approximately 1 in every 141,091 boys born was named Guilherme. RISING Recent data shows the name is currently rising.