You might be interested in watching this: <a href="http://www.youtube.com/watch?v=IzHv0HuKCrk&feature=plcp">http://www.youtube.com/watch?v=IzHv0HuKCrk&feature=plcp</a>;

^^

1000 years ago.

The Shilla dynasty was built by Kim family. Since then, there are lots of kim's decendants living here in Korea and using his surname.

Half of Korean use as their family name Kim, Park, Yi, Chae.