Sianna is a distinctive girls' name in England & Wales, ranking #1272 in 2018 with 26 recorded births. The name reached its all-time peak in 2013 with 43 births ranking #865. Since 1996, the popularity has increased by 333.3%. In 2018, approximately 1 in every 11,087 girls born was named Sianna. FALLING Recent data shows the name is currently falling.