Guilherme is a distinctive boys' name in United States, ranking #9195 in 2025 with 8 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 14.3%. In 2025, approximately 1 in every 213,510 boys born was named Guilherme. RISING Recent data shows the name is currently rising.