The Irish, English and Scottish surname Tomlin is of patronymic origin being derived from a pet form of Tom, a short form of the personal name Thomas. The ancestors of the Tomlin name in Ireland arrived in the wake of the Anglo-Norman invasion in the 12th Century. The name is found most frequently in counties Carlow, Fermanagh and Antrim. The name is first recorded in the New World in 1636 when Matthew Tomlin arrived in Virginia. Today there are approximately 12,000 bearers of the name Tomlin living in the US.