First off, let’s get his name straight. His name is Kenyon Lee Martin Junior. His father, a redoubtable NBA player in his own right is named, naturally enough, Kenyon Lee Martin. His dad was nicknamed KMart, along with Kevin Martin, or Another KMart, the weird shot one (who was also a Rocket). This is unfortunate, as in seemed to suggest he was a value-conscious sort of player.
For those who never experienced KMart, the store, it was kind of a low price Target, before Walmart filled that role (and every other, in some places). It was known for having lower prices, shabbier stores, going into bankruptcy several times, and having “Blue Light Specials”.