(Italian) and (Spanish) form of Theresa. In the English-speaking world the name is often chosen in this spelling by Roman Catholics, with particular reference to the Spanish saint, Teresa of Ávila (Teresa Cepeda de Ahumada, 1515–82).
Welsh: Anglicized form of Welsh ap Rhys ‘son of Rhys’ (see Reece). This is one of the commonest of Welsh surnames. It has also been established in Ireland since the 14th century, where it is sometimes a variant of Bryson.