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).
Suzanne was a common American name in the 1960s but is rarely given today. It's been given to 253,026 U.S. babies all time and once ranked 482nd by sound, peaking at 7,633 in 1962 (down to 89 in 2025).
By sound, Suzanne also includes the spellings Susanne, Suzann, Susann.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).