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).
Azariah has been climbing in recent years. All-time it's been given to 13,947 U.S. babies, the 644th most common name by sound today, peaking at 1,108 in 2025, with 1,108 in 2025.
Azariah has no common alternate spellings by sound. Spellings sometimes heard the same way: Azaria.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).