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).
Luis
Luis is down from its peak but still widely used. All-time it's been given to 297,849 U.S. babies, the 273rd most common name by sound today, peaking at 8,150 in 2007, with 2,510 in 2025.
By sound, Luis also includes the spellings Luiz.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).