I'm of the opinion that middle names should be family names, or possibly something with significance, not names just chosen because you like the sound of it. Yes I know it's a free world and my own middle name is very much a 'vanity' middle name (ta, mum) but I just think it's a bit silly. Pick a dead relative, or even a living one, or if you hate your family, just don't bother with a middle name at all!
Especially hate filler names, too many Isla Graces and Jessica Roses!
Sorry if I'm being offensive, was just interested to know if this is just me?