If you've ever wondered what the last names of the characters are, they have been revealed today through the release of Rush of Blood! Once a level ends, the player will see a local list of high scores. The full list:

Josh Washington

Chris Hartley

Emily Davis

Mike Munroe

Matt Taylor

Sam Giddings

Jessica Riley

Ashley Brown

You can see it here: https://youtu.be/wusEkEnUy3c?t=1051

I've added the full names to the pages.