Tamsin is a distinctive girls' name in United States, ranking #11523 in 2004 with 9 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 28.6%. In 2004, approximately 1 in every 204,013 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.