Tamsin is a distinctive girls' name in United States, ranking #6677 in 2014 with 19 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 171.4%. In 2014, approximately 1 in every 93,997 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.