In the course of the Rhine straightening project in the 19th century, Kisselwörth and Sändchen were enlarged with landfill and current control works.

Another explanation that has developed in the course of history according to which the name derives from the place's location in the "neck of the mountain" (in German: im Nacken des Berges).

The municipality's arms might be described thus: A bar argent, in chief sable an orb of the first, in base a wheel spoked of six of the first.

In an expert's report from 25 May 1984, Chief Archivist Dr. Debus from the Speyer State Archive (Landesarchiv Speyer) made the following remarks: "Above the Nackenheim Town Hall entrance is found an arms stone, which deviates from the arms in question on the following points: Instead of the cross, a hook with a pointed angle adorns the globus cruciger, and the wheel is eight-spoked.

… The keystone above the Town Hall entrance yields, surely in unwitting transformation, the always six-spoked Wheel of Mainz, for it could only be this, with eight spokes.

In 1792, after the French Revolutionary army had marched in, a commander's office under Civil General Daniel Stamm moved in.

In 1793, the citizenry elected, instead of the Schultheiß Johannes Herd the local clergyman Dr. Karl Melchior Arand as maire.

Beginning in 1797, when Nackenheim would belong to France for 17 years, only an adjunct was in office at town hall; the maire sat in Bodenheim.

In 1822, Nackenheim got an independent "Grand-Ducal Hessian Mayoralty" (Großherzogliche Hessische Bürgermeisterei) under mayor Johann Schneider (1822–1831).

Only in 1931 was a Madonna figure – "Mary Mother of Peace" – put there on council member Dr. Franz Usinger's motion to give thanks for the freeing of the Rhineland by Allied troops.