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).
Brenda
Brenda is now well below its former popularity. All-time it's been given to 610,597 U.S. babies, the 1,807th most common name by sound today, peaking at 24,395 in 1957, with 139 in 2025.
Brenda has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).