The name Diesel is a boy's name . Diesel and is often added to lists like Badass Baby Names and discussed in our forums with posts like "Love, Like, Lose -- Outlandish/Guilty Pleasures edition!".
From the experts:
Diesel, which you can think of as a word name for the fuel or as a German surname that derives from a pet form of Matthew or Mathias, is a new entry to the American name lexicon thanks to celebrities Jennie Finch and Casey Daigle, who chose it for their son, baby brother of Ace. Diesel might also be thought of as one of the neo-macho names, joining such bros as Harley, Ranger, and Breaker.