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).
Brendan
Brendan has been slowly declining from its former popularity. All-time it's been given to 153,118 U.S. babies, the 1,169th most common name by sound today, peaking at 6,413 in 1999, with 356 in 2025.
By sound, Brendan also includes the spellings Brenden, Brendon, Brenton.
Rising