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).
Zara has been climbing in recent years. All-time it's been given to 23,887 U.S. babies, the 491st most common name by sound today, peaking at 1,640 in 2022, with 1,583 in 2025.
By sound, Zara also includes the spellings Zarah.