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).
Sierra
Sierra was more common in the past and has since settled at a lower, steady level. All-time it's been given to 134,420 U.S. babies, the 968th most common name by sound today, peaking at 7,858 in 1998, with 546 in 2025.
By sound, Sierra also includes the spellings Cierra, Ciarra, Siera. Spellings sometimes heard the same way: Ciara.
Rising