Thousands of trenches were constructed during World War 1. Most had names for operational purposes but few names are remembered.
EDIT:
Are you thinking of World War 2 and the Maginot Line?
Trench Coats got their names because they were originially designed for use in the Military during the World Wars and were worn in the trenches. As such when the article of clothing was transferred to civilian use it kept the name Trench Coat.
Trench foot got its name because during World War I many of the soldiers who fought in the trenches got trench foot because of the constantly damp conditions of their shoes in the trenches.It is not known exactly when or where the disease was given it's apt name but I'd imagine it was just a general term used by the soldiers that it was eventually accepted as it's name. The proper name of Trench Foot, however, is 'immersion foot'.
As the name suggests a Firestep was where a rifle was fired from. It was part of thre trench that was stood on to see over the parapet. It was raised from the level of the trench which was used as cover from view by the enemy.
poiluPoilu, which literally means "hairy one," was a warm, informal term for French infantrymen, particularly during World War I.
Maginot Line
Marianas Trench
Trench Coats got their names because they were originially designed for use in the Military during the World Wars and were worn in the trenches. As such when the article of clothing was transferred to civilian use it kept the name Trench Coat.
Herbert Trench's birth name is Frederick Herbert Trench.
bomb
Trench warfare.
Trench guns, first used in the first world war may also be referred to as combat shotguns, riot shotguns, trench shotguns, bayonets, muskets or blunderbusses.
Mariana's Trench
aleutian trench
The Statue of Liberty was built by French sculptor Auguste Bartholdi.
The name of marianas trench's band IS marianas trench! (you anwered your own question there mart one -.-)
The deepest spot in the ocean is called the Marianas Trench.
The correct name for "trench foot" is Immersion foot. This occurs when the feet are constantly kept wet for a prolonged period of time. An example of this was during World War One, where soldiers in the trenches would be stood most of the time in pools of water. This was also the origins of the name "trench foot".