Theresa is of Latin origin and means 'harvest' or 'to harvest'. It was traditionally used as a feminine form of the Roman family name Terentius, derived from the Etruscan word 'thesera', meaning 'to reap'. This name has been popular in many English-speaking countries for centuries. Notable individuals named Theresa include Saint Teresa of Ávila, a Spanish nun and mystic, and Saint Teresa of Calcutta, known for her humanitarian work with the poor and sick.
"The name Thersea experienced its peak popularity between 1955 and 1963, with an average of 9 births per year during this period."