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).
Collins
Collins has been climbing in recent years. All-time it's been given to 14,465 U.S. babies, the 542nd most common name by sound today, peaking at 1,334 in 2023, with 1,334 in 2025.
Collins has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).