Tamsin is a moderately popular girls' name in England & Wales, ranking #349 in 1998 with 96 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 29.9%. In 1998, approximately 1 in every 3,012 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.