Derived from a popular medieval first name, THOMAS comes from the Aramaic term t’om’a, for "twin." The Thomas surname is of patronymic origin, based on the first name of the father, meaning "son of Thomas," much like Thomason.
Thomas is the 14th most popular surname in the United States and the 9th most common in England.
From the Hebrew personal name Adam which was borne, according to Genesis, by the first man. Uncertain entymology. Possibly from the Hebrew word adama meaning "earth", connecting to the Greek legend that Zeus fashioned the first human beings from earth.
The "s" ending generally indicates a patronymic surname, meaning "son of Adam."