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).
Allison
Allison has been easing down from its peak but is still widely used. All-time it's been given to 533,835 U.S. babies, the 164th most common name by sound today, peaking at 12,400 in 1994, with 4,221 in 2025.
By sound, Allison also includes the spellings Alison, Allyson, Alyson, Alisson, Allisson.
Rising