Guilherme is a distinctive boys' name in United States, ranking #3756 in 2005 with 25 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 257.1%. In 2005, approximately 1 in every 79,886 boys born was named Guilherme. RISING Recent data shows the name is currently rising.