Caton -- more accurately Katon -- is a rather rare classical Greek name (registered in "A Lexicon of Greek Personal Names,"
http://www.lgpn.ox.ac.uk/index.html). It is derived from the word "kato" meaning "below" or, metaphorically, "underworld".
The name also appears in the Latin form of Cato, which apparently means "sagacious" (Nanaea and Hid Diva, our resident Latinos, corret me if I'm wrong).
And of course let us not forget Kato, Inspecteur Clouseau's trusty oriental sidekick.