Guilherme is a distinctive boys' name in United States, ranking #5784 in 1999 with 11 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 57.1%. In 1999, approximately 1 in every 174,553 boys born was named Guilherme. RISING Recent data shows the name is currently rising.