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).
Jacqueline is now well below its former popularity. All-time it's been given to 637,329 U.S. babies, the 688th most common name by sound today, peaking at 14,307 in 1964, with 886 in 2025.
By sound, Jacqueline also includes the spellings Jacquelyn, Jaclyn, Jacklyn, Jaqueline, Jacquelin, Jacquline, Jackeline, Jacalyn, Jacquelynn, Jackelyn, Jaquelin. Spellings sometimes heard the same way: Jacquelyne.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).