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).
Angel was more common in the past and has since settled at a lower, steady level. All-time it's been given to 367,453 U.S. babies, the 111th most common name by sound today, peaking at 13,842 in 2006, with 5,308 in 2025.
By sound, Angel also includes the spellings Angle.