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).
Aaron has been easing down from its peak but is still widely used. All-time it's been given to 1,001,421 U.S. babies, the 107th most common name by sound today, peaking at 30,597 in 1983, with 5,385 in 2025.
By sound, Aaron also includes the spellings Erin, Aron, Arron, Eryn, Arin, Erinn, Aryn, Aren, Eren, Aaryn.