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).
Shannon
Shannon is now well below its former popularity. All-time it's been given to 360,189 U.S. babies, the 1,974th most common name by sound today, peaking at 16,797 in 1970, with 116 in 2025.
By sound, Shannon also includes the spellings Shanon, Shannan.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).