>I'm pretty sure the maps and picture files at least have unique names. I just wish I could look into this myself.
We use the translation of the japanese names for those things, which are in turn taken from the game itself. For example, Madotsuki's room is called "Real Room", and when she goes to sleep, the map is called "Dream Room". Same with the balcony.
Some names are pretty useless/obvious, too, and the fan-names are actually better. The nexus is called "Door(s) Room". The forest map is called "Frog" and the spike plaza thing inside it is called, unsurprisingly, "spike". The block world is called "hat and scarf", puddle world is called "umbrella". If you're smart enough you will realize the name of these maps are actually the names of the effects inside them. There are a few more like this, like yuki-onna, hair, bicycle, medamaude, midget, etc.
The long Road is in a map called "Road", does it ring a bell?
The Wilderness is actually called "砂", which is just an abbreviation of "砂漠", "Desert". Onsen-san is inside of a "小屋", hut/cabin. The stairs to sky garden are called "砂階段", "Desert Stairs". The sky garden itself is just called "公園", Park. The city light cliff is called, pin pon, "公園崖", park cliff. The ghost world is called "塀", wall. The flower path is called "レンガの中", Inside the blocks.
Kamakurako in the snow-world is inside a map called "かまくら" (Snow hut). Mind blowing, I bet.
The Sewers are called "どぶ", can you guess?
Big red is called "Red Room". The windmill map is called "座敷洞", Tatami Room. You know, this guy http://yumenikki.wikia.com/wiki/Cube_Guru
The mall is called "デパート", Department Store, AKA Mall. The roof is called "Mall Roof", and the witch event is called "Broom Flight".
E-man's office is called "Entrance". O-man is in office B, and tokuto is in office C.
The Footprint Path is called "Footprint Path", wow.
The chess-style tiled path is called, "check". Neon Tile path is… oh I bet you can sum.
The Stairs when you sleep again in the dream room are called "Stairs inside the bed"
All the entrances to the FC world are called "Entrance to FC". This includes the static maze and the other one I don't remember where it is.
Hell is just called "Red". The Barracks are called "Earth". The dark forest where shitai-san is is called "樹海", "Sea of Trees", AKA woodland. The traincar map is called "樹海電車", "Train of the woods", basically. Curiously, the witch island is part of the family of these 樹海 maps, with the addition of two maps called "橋" (bridge), and "岸" (shore).
The white desert is just called "モノ" (CAN YOU GUESS??!?).
The Pink sea is called "浅瀬", (Shallows/Shallow Waters). Poniko's house is called "浅瀬の家" (House in the Shallows).
The docks are actually called "湖回廊" (Lake Cloister, because corridor doesn't fit this shit).
Mars is called… mars.
Everything inside the FC world is called "FC *". The house is "FC house", "FC house underground", "FC village", etc.
Very curiously, the number world is actually called "電燈", which translates as "Electric Light". Sometimes it is used as flashlight but this isn't the case. The rooms inside this places are all called "Electric Light [World] Small Room". The Face Event is called "映像", Image.
The teleport maze is called "兄弟", "Brothers". Now that's kinda unexpected but then again it's obvious why http://yumenikki.wikia.com/wiki/Warpo_and_Loople
I guess the wiki should add to the trivia that they're brothers.
Lastly, there the last two maps are "fami game" (nasu) and "ending".