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).
Irene
Irene is now well below its former popularity. All-time it's been given to 356,812 U.S. babies, the 1,121st most common name by sound today, peaking at 10,657 in 1921, with 442 in 2025.
Irene has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).