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).
Calliope
Calliope has been climbing in recent years. All-time it's been given to 7,421 U.S. babies, the 848th most common name by sound today, peaking at 795 in 2025, with 795 in 2025.
By sound, Calliope also includes the spellings Kalliope.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).