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).
Mahlon has been climbing in recent years. All-time it's been given to 14,222 U.S. babies, the 937th most common name by sound today, peaking at 698 in 2024, with 581 in 2025.
By sound, Mahlon also includes the spellings Maylin, Maelynn, Maelyn.