Sydnei is a distinctive girls' name in United States, ranking #6820 in 2011 with 19 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 44.1%. In 2011, approximately 1 in every 92,569 girls born was named Sydnei. RISING Recent data shows the name is currently rising.