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).
Preston
Preston has been slowly declining from its former popularity. All-time it's been given to 123,757 U.S. babies, the 588th most common name by sound today, peaking at 3,814 in 2007, with 1,141 in 2025.
Preston has no common alternate spellings by sound.
Rising