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 was more common in the past and has since settled at a lower, steady level. All-time it's been given to 267,952 U.S. babies, the 154th most common name by sound today, peaking at 7,030 in 2005, with 4,032 in 2025.
By sound, Ian also includes the spellings Ean, Iain.
Rising