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).
Katie
Katie is now well below its former popularity. All-time it's been given to 267,513 U.S. babies, the 932nd most common name by sound today, peaking at 9,287 in 1986, with 511 in 2025.
By sound, Katie also includes the spellings Katy, Kati.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).