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).
Ruby
Ruby is down from its peak but still widely used. All-time it's been given to 401,033 U.S. babies, the 191st most common name by sound today, peaking at 8,819 in 1924, with 3,830 in 2025.
By sound, Ruby also includes the spellings Rubi, Rubye, Rubie.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).