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).
Janiyah is now well below its former popularity. All-time it's been given to 32,333 U.S. babies, the 1,013th most common name by sound today, peaking at 2,343 in 2008, with 505 in 2025.
By sound, Janiyah also includes the spellings Janiya, Janiah, Jania.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).