I do not know if this tweak exists or not

I would very much like to be able to exclude contacts from being considered when I voice dial.

I have the unfortunate circumstance of having several contacts named the same or sounding similar and some are bosses, girlfriends, sisters, etc. I call them wrongly often enough that I'm seeking a tweak.

I do not know if this is possible at all but it would be awesome. Sure I could rename something like "DONOTCALL name" but I want a more elegant solution. I sync with google contacts and I don't want to dirty up that list.