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).
Damian has climbed over the years and is holding near its high. All-time it's been given to 196,468 U.S. babies, the 159th most common name by sound today, peaking at 5,920 in 2013, with 4,236 in 2025.
By sound, Damian also includes the spellings Damien, Damion, Dameon.