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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).
Kathy
Kathy was a common American name in the 1950s but is rarely given today. It's been given to 536,297 U.S. babies all time and once ranked 79th by sound, peaking at 36,653 in 1958 (down to 60 in 2025).
By sound, Kathy also includes the spellings Cathy, Kathie, Kathi, Cathie.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).