Guilherme is a distinctive boys' name in United States, ranking #4172 in 2004 with 21 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 200.0%. In 2004, approximately 1 in every 94,514 boys born was named Guilherme. RISING Recent data shows the name is currently rising.