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).
Kobe has been climbing in recent years. All-time it's been given to 42,244 U.S. babies, the 617th most common name by sound today, peaking at 2,634 in 2001, with 868 in 2025.
By sound, Kobe also includes the spellings Coby, Koby, Kobi.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).