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).
Nehemiah
Nehemiah climbed for decades and has been a steadily popular name ever since. All-time it's been given to 22,439 U.S. babies, the 813th most common name by sound today, peaking at 969 in 2010, with 768 in 2025.
Nehemiah has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).