Tamsin is a distinctive girls' name in England & Wales, ranking #692 in 2011 with 56 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 59.1%. In 2011, approximately 1 in every 5,738 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.