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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).
Dylan
Dylan is down from its peak but still widely used. All-time it's been given to 523,065 U.S. babies, the 48th most common name by sound today, peaking at 21,143 in 1992, with 7,215 in 2025.
By sound, Dylan also includes the spellings Dillon, Dillan, Dilan, Dylon, Dyllan.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).