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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).
Kelly
Kelly is now well below its former popularity. All-time it's been given to 743,185 U.S. babies, the 1,038th most common name by sound today, peaking at 26,896 in 1969, with 471 in 2025.
By sound, Kelly also includes the spellings Kelli, Kelley, Kellie, Keli, Kellee.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).