Weird Coincidence

Screenhunter_03_may_10_1828From Answers.com:

Today’s an auspicious day for the dark side: John Wilkes Booth (1838-1865), James Earl Ray (1929-1998) and Mark David Chapman (52) were all born on May 10. In 1865, Booth shot and killed President Abraham Lincoln, who was attending a performance at Ford’s Theatre. Ray took the life of Martin Luther King, Jr., in 1968, as King stood on a hotel room balcony in Memphis, TN. And in 1981, Chapman murdered John Lennon as Lennon arrived at his home in NYC.

Also, does anyone know why assassins are almost always known by their full names, meaning their middle name is also always included? Why not just Lee Oswald, for example?