Etymology of the ending "un"?

I looked in the Oxford English Dictionary and there is nothing on the suffix "un" nor on "starved-un." It has been used as a prefix from Old English to the modern day. The example of "young-un" is a contraction of "young one" and seems to be an American colloquialism starting (to be written at least) in 1810. That is what the OED says. It had nothing on starved being remotely related to cold either. Maybe it would be best to do local research. Not every colloquialism makes its way into the OED. :)