Tamsin is a distinctive girls' name in United States, ranking #13233 in 2011 with 8 recorded births. The name reached its all-time peak in 2017 with 27 births ranking #5033. Since 1996, the popularity has increased by 14.3%. In 2011, approximately 1 in every 219,851 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.