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).
Gael has been climbing in recent years. All-time it's been given to 49,752 U.S. babies, the 197th most common name by sound today, peaking at 3,879 in 2024, with 3,866 in 2025.
Gael has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).