Tamsin is a moderately popular girls' name in England & Wales, ranking #381 in 2001 with 84 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 38.7%. In 2001, approximately 1 in every 3,190 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.