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).
Nico
Nico has been climbing in recent years. All-time it's been given to 37,457 U.S. babies, the 270th most common name by sound today, peaking at 3,161 in 2025, with 3,161 in 2025.
By sound, Nico also includes the spellings Niko.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).