Mackerel? Just kidding.
Famous people named Mack:
Football players Mack Herrin, Mack Hill, Mack Flenniken, and Mack Mitchell; composer/lyricist Mack Gordon; songwriter Mack David; actor/comedian Mack Sennett.
Mack is the name of - you guessed it - a truck in Disney/Pixar's Cars.
Fab Four-Letter Names For Boys, Magnificent M Names For Baby Boys, Simple One-Syllable Boy Names, Yee-Haw! Boy Names That Are A Little Bit Country, Boy Names People Won’t Shorten, Short, Sweet Baby Boy Names,