Tamsin is a distinctive girls' name in United States, ranking #9389 in 2005 with 12 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 71.4%. In 2005, approximately 1 in every 153,975 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.