In 2018, 49 is the most common age for an American (U.S.) Theresa who is registered female with the Social Security Administration. It is the 148th most common female first name for living U.S. citizens. *as a first name, not a nickname.
― Anonymous User 10/8/2018
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Also occasionally used in Brazil as a specifically Brazilian variant of the more common Teresa.
*as a first name, not a nickname.