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).
Peter
Peter was more common in the past and has since settled at a lower, steady level. All-time it's been given to 591,531 U.S. babies, the 422nd most common name by sound today, peaking at 11,628 in 1957, with 1,954 in 2025.
Peter has no common alternate spellings by sound.
Rising