Tamsin is a distinctive girls' name in United States, ranking #12159 in 2010 with 9 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 28.6%. In 2010, approximately 1 in every 197,481 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.