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).
Kendra
Kendra is now well below its former popularity. All-time it's been given to 98,788 U.S. babies, the 1,240th most common name by sound today, peaking at 3,863 in 1987, with 320 in 2025.
Kendra has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).