We have a room which is probably having an identity crisis, because it's been called so many things
The people who sold us the house called it 'the new lounge' - it's an extension that wasn't quite finished when we first saw the house.
The estate agents called it the 'Family Room', which is a name I hate. It became the 'playroom' while the DCs were young, but they asked me to stop calling it that when they were teenagers, so it became 'The Other Room', though its most frequent use was a a kind of dormitory for sleepovers.
After they had both gone to university last year it degenerated into 'The Junk Room' which we hardly ever went into (I moved the Christmas tree into it, still fully decorated, in a hurry when I had people coming over, and it stayed there until July )
DS came home from university this summer & started to reorganise/redecorate everywhere while looking for a job. He turfed out most of the junk, we got a new sofa bed & it now has TV/DVD/Playstation, music stuff & the desktop PC, as well as a lot of books - so I suppose 'Media Room' might be the best name. It's actually quite nice in there now, but the radiator doesn't work very well,so it's always rather cold.
At some point it will probably turn into a downstairs bedroom for either my Dad or (God forbid) MIL if either becomes unable to live alone, so it has yet another function to look forward to...