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).
Declan
Declan has been easing down from its peak but is still widely used. All-time it's been given to 61,434 U.S. babies, the 255th most common name by sound today, peaking at 4,172 in 2019, with 2,644 in 2025.
By sound, Declan also includes the spellings Deklan.
Rising