Sydnei is a distinctive girls' name in United States, ranking #4772 in 2000 with 25 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 26.5%. In 2000, approximately 1 in every 72,639 girls born was named Sydnei. RISING Recent data shows the name is currently rising.