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).
Brady
Brady is now well below its former popularity. All-time it's been given to 98,908 U.S. babies, the 602nd most common name by sound today, peaking at 5,015 in 2007, with 1,123 in 2025.
Brady has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).