Tamsin is a distinctive girls' name in United States, ranking #10727 in 2008 with 11 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 57.1%. In 2008, approximately 1 in every 171,883 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.