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).
Aspen
Aspen has been climbing in recent years. All-time it's been given to 31,823 U.S. babies, the 408th most common name by sound today, peaking at 2,088 in 2022, with 1,761 in 2025.
By sound, Aspen also includes the spellings Aspyn.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).