Tamsin is a distinctive girls' name in United States, ranking #7069 in 2018 with 17 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 142.9%. In 2018, approximately 1 in every 100,025 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.