Guilherme is a distinctive boys' name in United States, ranking #3091 in 2001 with 29 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 314.3%. In 2001, approximately 1 in every 66,994 boys born was named Guilherme. RISING Recent data shows the name is currently rising.