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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).
Richard
Richard has been slowly declining from its former popularity. All-time it's been given to 2,587,082 U.S. babies, the 479th most common name by sound today, peaking at 58,990 in 1946, with 1,505 in 2025.
Richard has no common alternate spellings by sound.
Rising