Spiro is a distinctive boys' name in United States, ranking #8804 in 2004 with 8 recorded births. The name reached its all-time peak in 2008 with 10 births ranking #8222. Since 1996, the popularity has decreased by 11.1%. In 2004, approximately 1 in every 248,100 boys born was named Spiro. FALLING Recent data shows the name is currently falling.