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).
Celine has been climbing in recent years. All-time it's been given to 28,240 U.S. babies, the 462nd most common name by sound today, peaking at 1,935 in 2025, with 1,935 in 2025.
By sound, Celine also includes the spellings Selene.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).