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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).
Johnny
Johnny is now well below its former popularity. All-time it's been given to 515,255 U.S. babies, the 715th most common name by sound today, peaking at 10,767 in 1947, with 863 in 2025.
By sound, Johnny also includes the spellings Johnnie, Johnie, Jonnie, Johny, Jonny.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).