* (Beekdaelen) First attested as Helle in 1803-1820. Derived from either helle (“lowland, marshland”) or a deformation of *helde (“slope, incline”). See also Limburgish G'n Hèl.
* (Gulpen-Wittem) First attested as Hölle in 1803-1820. Likely derived from helle (“lowland, marshland”). A derivation from *helde (“slope, incline”) is less likely when the oldest attestation of the toponym is taken into account.