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).
Azalea
Azalea has been climbing in recent years. All-time it's been given to 11,739 U.S. babies, the 713th most common name by sound today, peaking at 1,109 in 2025, with 1,109 in 2025.
Azalea has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).