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).
Kathleen
Kathleen is now well below its former popularity. All-time it's been given to 752,905 U.S. babies, the 1,602nd most common name by sound today, peaking at 27,715 in 1951, with 211 in 2025.
By sound, Kathleen also includes the spellings Cathleen, Kathaleen, Kathlene.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).