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).
Ian
Ian climbed for decades and has been a steadily popular name ever since. All-time it's been given to 265,041 U.S. babies, the 150th most common name by sound today, peaking at 6,924 in 2005, with 4,021 in 2025.
By sound, Ian also includes the spellings Ean.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).