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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).
Vicki
Vicki was a common American name in the 1950s but is rarely given today. It's been given to 330,411 U.S. babies all time and once ranked 242nd by sound, peaking at 18,647 in 1957 (down to 35 in 2025).
By sound, Vicki also includes the spellings Vickie, Vicky, Vikki, Vickey.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).