At least two
Two
David had many wives Michal, Bathsheba were a few of them.
4
The Bible does not discuss King David's mother in detail, as is the case with many women in the Scriptures. She was the wife of Jesse. However, the Talmud claims that Nitzevet bat Adiel (נצבת בת עדאל) is his mother's name.The mother don't mentions her name but the Talmud identifies her as Nitzevet.
David Boreanaz has 2 children
David DeLuise has 2 children
David Koechner has 5 children
David Peterson has 3 children
David Brinkley has 4 children
David Remnick has 3 children
david Henrie has 2 children
michal, abigail, Bathsheba, ahinoam, Maacah - and thats all i know but he had many more, concubines and all!