Actually it was named after Christopher Columbus. Reason being that Columbus circle the globe.
From their website...
http://columbus.cessna.com/downloads.html
"The Citation business jets we build are known across the globe as the Sure Thing. The more you think about it, the more it just makes sense that the largest business jet company in the world would build one of the larger, most capable, comfortable, longest-range business jets in the world. When the time comes for you to set sail in your own Citation Columbus, you can do it with complete and total confidence"
Also if you watch the little video at the end it is the logo of a sailing ship.