Sydnei is a distinctive girls' name in United States, ranking #10168 in 2013 with 11 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 67.6%. In 2013, approximately 1 in every 159,492 girls born was named Sydnei. RISING Recent data shows the name is currently rising.