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).
Zane has climbed over the years and is holding near its high. All-time it's been given to 93,759 U.S. babies, the 189th most common name by sound today, peaking at 4,333 in 2018, with 3,618 in 2025.
By sound, Zane also includes the spellings Zayn, Zayne, Zain.