From the American Heritage dictionary:

Ox·o·ni·an (n) adj. 1. Of, relating to, or characteristic of Oxford or Oxford University. n. 1. A native or inhabitant of Oxford. 2. A person who studies or has studied at Oxford University. [From Medieval Latin Oxonia; Oxford from Old English Oxnaford; oxena, genitive pl. of oxa ox; See ox ford; See ford]