For me the suffix like (fl) are helpful and easy to know. But real names are quite more interesting than numbers like flatinland_01 etc.
I would prefer a mix of it. At first the name should express for how many armies the map is used to be, then some information about the terrain and at last a name of the map.
For example:
(8f)Fields_of_Agincourt: You see its for 8 players, its almost flat and "fields" causes an impression of the terrain, and the name Agincourt makes it easy to remember it.
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