There is a name we were heavily considering as a middle name. Mostly because we like it, but one grandfather on each side happens to share it, and it is also my brother's middle name. Both grandfathers were pretty dysfunctional. Not horrible people or anything, in fact, very nice people. And everyone is a bit dysfunctional in their own way, but there is some significant dysfunction and pain surrounding them (from many years ago). If we used this name, MIL would also be thrilled (her father's name) and also point out all the time that LO is "named after him", when that isn't really 100% the case (we more just like the name and recognize that it has a presence across both families).
Would these factors cause you to choose a different middle name?