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).
Douglas
Douglas was more common in the past and has since settled at a lower, steady level. All-time it's been given to 567,881 U.S. babies, the 1,417th most common name by sound today, peaking at 16,883 in 1957, with 308 in 2025.
By sound, Douglas also includes the spellings Douglass.
Rising