Nicholaus is a distinctive boys' name in United States, ranking #2515 in 2005 with 45 recorded births. The name reached its all-time peak in 1999 with 88 births ranking #1364. Since 1996, the popularity has decreased by 45.1%. In 2005, approximately 1 in every 44,381 boys born was named Nicholaus. FALLING Recent data shows the name is currently falling.