Tamsin is a distinctive girls' name in United States, ranking #6010 in 2015 with 22 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 214.3%. In 2015, approximately 1 in every 81,121 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.