Sydnei is a distinctive girls' name in United States, ranking #6068 in 2009 with 23 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 32.4%. In 2009, approximately 1 in every 79,864 girls born was named Sydnei. RISING Recent data shows the name is currently rising.