History

from Wikipedia

There is a great deal of uncertainty over the origin of the name "Monster". It is probably derived from the Latin monasterium, meaning monastery. The name was also used for the ground that belonged to a monastery. Another explanation was that Monster was derived from the old-Dutch word monster, which meant amongst others "big church" (from Latin: monstrum), which is supported by the fact that Monster had those days one of the largest churches in the area.