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).
Selah has been climbing in recent years. All-time it's been given to 15,394 U.S. babies, the 609th most common name by sound today, peaking at 1,429 in 2025, with 1,429 in 2025.
Selah has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).