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).
Muhammad has been climbing in recent years. All-time it's been given to 78,392 U.S. babies, the 262nd most common name by sound today, at an all-time high of 3,129 in 2025.
By sound, Muhammad also includes the spellings Mohamed, Mohammad, Mohammed, Mohamad. Spellings sometimes heard the same way: Muhammed.