How to read the band →
Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Teresa
Teresa is now well below its former popularity. All-time it's been given to 827,889 U.S. babies, the 1,117th most common name by sound today, peaking at 31,132 in 1961, with 427 in 2025.
By sound, Teresa also includes the spellings Theresa, Tresa.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).