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).
Sheila
Sheila is now well below its former popularity. All-time it's been given to 294,006 U.S. babies, the 2,241st most common name by sound today, peaking at 11,259 in 1962, with 65 in 2025.
By sound, Sheila also includes the spellings Shelia, Shiela, Sheilah.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).