Ok. So we got married in 2002 and we didn't want to have two different last names, we didn't want to hyphenate, and nobody really liked the idea of us choosing one of our birth last names. So, we combined the last names which seemed to be slightly more popular, if only for the novelty.
We used to be Greg Kneser and Nicole (Nikki) Addison but are now the Knaddisons.
People occasionally ask us "how do you pronounce your last name?" While we are very particular about the pronunciation, the real answer is - who knows?
Generally we pronounce the K and the N with emphasis on the second syllable.