Tamsin is a distinctive girls' name in United States, ranking #5776 in 2016 with 23 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 228.6%. In 2016, approximately 1 in every 77,021 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.