Sydnei is a distinctive girls' name in United States, ranking #4927 in 2003 with 26 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 23.5%. In 2003, approximately 1 in every 70,271 girls born was named Sydnei. RISING Recent data shows the name is currently rising.