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).
Heidi
Heidi was more common in the past and has since settled at a lower, steady level. All-time it's been given to 155,772 U.S. babies, the 682nd most common name by sound today, peaking at 4,749 in 1972, with 995 in 2025.
By sound, Heidi also includes the spellings Heidy.
Rising