It is located on the Molenbeek in the Denderstreek, southeast of East Flanders and belongs to the Arrondissement of Aalst.

The population density is 513 inhabitants / km ². Erondegem was first mentioned in a charter of 868 or 869.

The first part of this compound is mostly assigned to a Germanic name, in this case Erond or Erold, the name of a currently unknown person.

In its totality, the compound Erondingahaim meant 'Erondingenheem, residence of the followers or tribal members of Erond.

Gem-toponym are typical for the period of Frankish land taking during the Merovingian era.