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).
Felix
Felix has been climbing in recent years. All-time it's been given to 84,180 U.S. babies, the 383rd most common name by sound today, peaking at 2,100 in 2024, with 2,074 in 2025.
Felix has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).