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).
Adrian is down from its peak but still widely used. All-time it's been given to 392,535 U.S. babies, the 129th most common name by sound today, peaking at 8,991 in 2008, with 4,842 in 2025.
By sound, Adrian also includes the spellings Adrienne, Adrianne, Adrien, Adriane, Adrain.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).