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).
Nia
Nia has been slowly declining from its former popularity. All-time it's been given to 33,223 U.S. babies, the 953rd most common name by sound today, peaking at 1,370 in 2001, with 513 in 2025.
By sound, Nia also includes the spellings Niya, Niyah. Spellings sometimes heard the same way: Nya, Nyah.
Rising