When Boeing merged with MD in 1996/97 it took on the MD-95 and developed it into the Boeing 717. The 717 originally started life in 1983 when a shortened version of the MD-81 was conceived and dubbed the DC-9-90. This emerged in 1991 dubbed the MD-87-105 before naming as MD-95. As an aside the original Boeing 717 was a 1960's derivative of the 707 that became the KC-135 which is what you may be alluding to.