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).
Brielle
Brielle climbed for decades and has been a steadily popular name ever since. All-time it's been given to 49,835 U.S. babies, the 366th most common name by sound today, peaking at 2,939 in 2018, with 2,071 in 2025.
Brielle has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).