There are various artists who have used this name.
1. Mike D is one of the founding members of the New York based hip hop band Beastie Boys.
2. Mike D is a rapper based out of Houston, Texas, who along with Clay Doe, Fat Pat and Mr. 3-2, formed the rap group Southside Playaz.
3. Mike D is an independent singer/songwriter from Toronto, Canada currently living in Los Angeles. Check him out on YouTube as "MrSoulfulwriter" and follow him @MikeyDeGuzman on Twitter. Read more on Last.fm