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).
Callum
Callum has been climbing in recent years. All-time it's been given to 19,595 U.S. babies, the 323rd most common name by sound today, peaking at 3,316 in 2025, with 3,316 in 2025.
By sound, Callum also includes the spellings Calum.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).