Guilherme is a distinctive boys' name in United States, ranking #2896 in 2006 with 39 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 457.1%. In 2006, approximately 1 in every 52,695 boys born was named Guilherme. RISING Recent data shows the name is currently rising.