How to read the band →
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).
Kenneth
Kenneth is now well below its former popularity. All-time it's been given to 1,299,877 U.S. babies, the 560th most common name by sound today, peaking at 28,364 in 1957, with 1,154 in 2025.
By sound, Kenneth also includes the spellings Kennith.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).