Cydney is a distinctive girls' name in England & Wales, ranking #627 in 2001 with 41 recorded births. The name reached its all-time peak in 2003 with 46 births ranking #630. Since 1996, the popularity has increased by 20.6%. In 2001, approximately 1 in every 6,536 girls born was named Cydney. FALLING Recent data shows the name is currently falling.