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).
Faith
Faith is now well below its former popularity. All-time it's been given to 148,142 U.S. babies, the 532nd most common name by sound today, peaking at 5,612 in 2003, with 1,220 in 2025.
Faith has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).