Looking for Meend etymology I found
The distribution and origin of meends in the Forest of Dean
There have been several interpretations of the origin of
meend. The most current and now widely accepted is that to be found in Smith’s “Place-Names of Gloucestershire” (1964).
[...] He considered that meend is derived from Old Welsh ‘minid’, meaning mountain’, and was rendered as munede during the medieval period, eventually occurring as meend through a variety of post-medieval forms such as myne and meene.
It has cognate forms along the Welsh Marches and in Wales as Mynydd.
It came to be used to deﬁne an area of open space, often associated with the royal forest.
...I venture to think that this view rests upon insufﬁcient basis. First of all, such ridges as are in the Forest have always been called so: i.e. Serridge. (13th c. Seyrrudge); and, when the 13th c. Forest-Scribe referred to an exceptional hill, he frankly terms it "Mons." Not a Single instance of
Mynydd has survived in that peculiarly conservative region; whereas there are over twenty Meands. Secondly, wherever this term occurs it carries the sense of open unﬁlled, or common, land, throughout the Bailiwicks; in fact, it is identical with the Meanelands of Co. Kent: lands held in common (A.S. gemǽne).
As mentioned in comments, we have gemeente and Mient's in Dutch - stemming from uncultivated land for common use - viz. Commons...