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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).
Lynn
Lynn was a common American name in the 1950s but is rarely given today. It's been given to 305,974 U.S. babies all time and once ranked 374th by sound, peaking at 11,685 in 1956 (down to 99 in 2025).
By sound, Lynn also includes the spellings Lynne, Lyn.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).