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).
Kendall has been slowly declining from its former popularity. All-time it's been given to 139,145 U.S. babies, the 493rd most common name by sound today, peaking at 4,462 in 2011, with 1,367 in 2025.
By sound, Kendall also includes the spellings Kendal, Kendell, Kyndall, Kendyl, Kyndal.