Theresa is of Greek origin, meaning 'harvest'. It was popularized by the Roman Catholic saint, Teresa of Ávila, who lived in the 16th century and was known for her spiritual writing. The name Theresa has been traditionally associated with Catholicism but is now used globally.
"The name Therisa saw a peak in popularity during the mid-20th century, with notable spikes in the late 1940s and throughout the 1950s and early 1960s. After a steady decline from the mid-1970s onwards, it seems to have made a slight resurgence in the early 1990s."