What does the suffix -mont mean?

The suffix 'mont,' likely is from mons. This could mean either a hill, or mount, but some historians point out that many geographic names with the suffix are not on a hill, but some are even in a valley. This brings into question if 'mount' does indeed mean 'hill.' Another source indicates 'mount' was used in Roman times to indicate a 'way-station' for travelers. This makes sense, but researching ancient roads, then yzing all geographic places on these roads to cross reference 'mont' would be needed.