Sydnei is a distinctive girls' name in United States, ranking #4995 in 2008 with 30 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 11.8%. In 2008, approximately 1 in every 63,024 girls born was named Sydnei. RISING Recent data shows the name is currently rising.