How to read the band →
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).
Mack
Mack has been climbing in recent years. All-time it's been given to 54,355 U.S. babies, the 646th most common name by sound today, peaking at 1,245 in 1942, with 1,063 in 2025.
By sound, Mack also includes the spellings Mac.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).