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).
Raiden climbed for decades and has been a steadily popular name ever since. All-time it's been given to 20,078 U.S. babies, the 596th most common name by sound today, peaking at 1,385 in 2022, with 1,054 in 2025.
By sound, Raiden also includes the spellings Rayden.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).