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).
Selena is now well below its former popularity. All-time it's been given to 112,661 U.S. babies, the 429th most common name by sound today, peaking at 5,732 in 1995, with 1,756 in 2025.
By sound, Selena also includes the spellings Selina, Celina, Salina, Salena, Celena.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).