Tamsin is a distinctive girls' name in United States, ranking #9066 in 2012 with 13 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 85.7%. In 2012, approximately 1 in every 135,442 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.