Tamsin is a moderately popular girls' name in England & Wales, ranking #447 in 2003 with 77 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 43.8%. In 2003, approximately 1 in every 3,619 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.