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 climbed for decades and has been a steadily popular name ever since. All-time it's been given to 93,759 U.S. babies, the 186th 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.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).