Sydnei is a distinctive girls' name in United States, ranking #8384 in 2015 with 14 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 58.8%. In 2015, approximately 1 in every 127,475 girls born was named Sydnei. RISING Recent data shows the name is currently rising.