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).
Bellamy
Bellamy has been climbing in recent years. All-time it's been given to 6,759 U.S. babies, the 821st most common name by sound today, peaking at 850 in 2022, with 715 in 2025.
Bellamy has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).