Sydnei is a distinctive girls' name in United States, ranking #5878 in 2002 with 20 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 41.2%. In 2002, approximately 1 in every 89,841 girls born was named Sydnei. RISING Recent data shows the name is currently rising.