Sylvanus is a distinctive boys' name in United States, ranking #12260 in 2002 with 5 recorded births. This places Sylvanus in the bottom 2% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2005 with 8 births ranking #8983. In 2002, approximately 1 in every 388,294 boys born was named Sylvanus. FALLING Recent data shows the name is currently falling.