Sydnei is a distinctive girls' name in United States, ranking #17674 in 2019 with 5 recorded births. The name reached its all-time peak in 2005 with 37 births ranking #3936. Since 1996, the popularity has decreased by 85.3%. In 2019, approximately 1 in every 335,514 girls born was named Sydnei. RISING Recent data shows the name is currently rising.