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).
Maxwell
Maxwell is now well below its former popularity. All-time it's been given to 109,467 U.S. babies, the 378th most common name by sound today, peaking at 3,773 in 2014, with 1,939 in 2025.
Maxwell has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).