Tamsin is a distinctive girls' name in England & Wales, ranking #506 in 2009 with 80 recorded births. The name reached its all-time peak in 1996 with 137 births ranking #271. Since 1996, the popularity has decreased by 41.6%. In 2009, approximately 1 in every 3,917 girls born was named Tamsin. FALLING Recent data shows the name is currently falling.