Sydnei is a distinctive girls' name in United States, ranking #7599 in 2014 with 16 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 52.9%. In 2014, approximately 1 in every 111,621 girls born was named Sydnei. RISING Recent data shows the name is currently rising.