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).
Jamie is now well below its former popularity. All-time it's been given to 557,011 U.S. babies, the 493rd most common name by sound today, peaking at 29,763 in 1976, with 1,375 in 2025.
By sound, Jamie also includes the spellings Jaime, Jami, Jayme, Jaimie, Jamey, Jammie, Jaimee, Jaymie. Spellings sometimes heard the same way: Jame.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).