Sydnei is a distinctive girls' name in United States, ranking #8052 in 2007 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 2007, approximately 1 in every 120,153 girls born was named Sydnei. RISING Recent data shows the name is currently rising.