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).
Carrie is now well below its former popularity. All-time it's been given to 608,545 U.S. babies, the 1,199th most common name by sound today, peaking at 19,618 in 1975, with 369 in 2025.
By sound, Carrie also includes the spellings Kerry, Kari, Kerri, Keri, Cary, Carey, Cari, Karrie, Kerrie, Karie, Karri, Carie, Carri, Kary.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).