I love the idea of middle names being after relatives.
If I have a boy his middle name will be James after my cousin who passed last year at the age of 30, bubba is also due on his birthday so my aunty would love that.
If it's a girl though I don't know. I wouldn't want to favour one nan over another hubby and I have 3 nans still alive, 2 of which are hubbys and have very old fashioned names such as beryl and the other is barbara. Neither I think would work well as middle names.
One of my nans has passed, but her Name was Ena again not a name that would fit with ours. My nan that is still alive is called Rosemary and I do love Rose as a middle name, and have thought of this separate from being called after my nan, but I wouldn't want to seem to be favouring any other nan. Oooh the decisions!! Its so hard. A name that they will live with forever