Guilherme is a distinctive boys' name in United States, ranking #3587 in 2009 with 30 recorded births. The name reached its all-time peak in 2006 with 39 births ranking #2896. Since 1996, the popularity has increased by 328.6%. In 2009, approximately 1 in every 66,110 boys born was named Guilherme. RISING Recent data shows the name is currently rising.