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).
Nasir
Nasir has been climbing in recent years. All-time it's been given to 17,971 U.S. babies, the 823rd most common name by sound today, peaking at 935 in 2019, with 617 in 2025.
Nasir has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).