Add to the list of cultures that use matrilineal genealogy, traditionally, Jewishness is also traced maternally (according to Halakha - Jewish law).

It seems to me that you've been thinking about this for a very long time, and have considered it on and off, but now more seriously. Sounds like you won't really get it off your mind until you either DO IT, or come up with an argument compelling enough to get it out of your head forever. Somehow I don't think the latter is your case, based on what you've told us. Given also that your own mother is very receptive to the idea, I'd say go for it.

Hey. Worst case scenario, you could always change it back if you don't like it. Really throw people for a loop!

Good luck with your new name, Mr. Kilpatrick.