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).
Rosa
Rosa was more common in the past and has since settled at a lower, steady level. All-time it's been given to 178,588 U.S. babies, the 1,133rd most common name by sound today, peaking at 2,245 in 1925, with 441 in 2025.
Rosa has no common alternate spellings by sound.
Rising