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).
Miller
Miller has been climbing in recent years. All-time it's been given to 13,935 U.S. babies, the 657th most common name by sound today, peaking at 1,392 in 2025, with 1,392 in 2025.
Miller has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).