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).
Gavin
Gavin is now well below its former popularity. All-time it's been given to 198,843 U.S. babies, the 489th most common name by sound today, peaking at 12,499 in 2007, with 1,156 in 2025.
By sound, Gavin also includes the spellings Gavyn, Gaven.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).