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).
Zayden has climbed over the years and is holding near its high. All-time it's been given to 46,326 U.S. babies, the 323rd most common name by sound today, peaking at 3,355 in 2014, with 2,186 in 2025.
By sound, Zayden also includes the spellings Zaiden, Zaden.