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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).
Leslie
Leslie is now well below its former popularity. All-time it's been given to 449,101 U.S. babies, the 835th most common name by sound today, peaking at 8,904 in 1957, with 617 in 2025.
By sound, Leslie also includes the spellings Lesley, Lesly, Lesli, Leslee.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).