It's name comes from a conversation between Sahad Nautilus and Laxia von Roswell, where Sahad mentioned the mountain reminded him of Euron, because "it's a real hardass that's always standing at attention". Laxia suggested naming it Gendarme, both after it's pinnacle and after the Gllian word for military police officer.
Ys VIII: Lacrimosa of Dana Edit
During the events of Ys VIII the mountain is inhabitated by numerous types of Primordials, such as the Giasburn, an enormous aviatic Primordial roosting on Gendarme Mountain's summit. These Primordials are part of the ongoing Lacrimosa.