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).
Zahra has been climbing in recent years. All-time it's been given to 9,395 U.S. babies, the 997th most common name by sound today, peaking at 562 in 2025, with 562 in 2025.
Zahra has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).