Etymology
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Mack

proprietary name for a brand of heavy automobile trucks, named for brothers John M., Augustus F., and William C. Mack, who established Mack Brothers Company, N.Y., N.Y., in 1902. Their trucks have been formally known as Mack Trucks from 1910.

updated on October 26, 2018

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Definitions of Mack from WordNet

mack (n.)
a waterproof raincoat made of rubberized fabric;
Synonyms: macintosh / mackintosh / mac
From wordnet.princeton.edu, not affiliated with etymonline.