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).
Hattie
Hattie has been climbing in recent years. All-time it's been given to 105,691 U.S. babies, the 770th most common name by sound today, peaking at 2,006 in 1918, with 923 in 2025.
Hattie has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).