Oc·ci·tan 
(ŏksĭ-tăn′)
(ŏksĭ-tăn′)n.
1. See Provençal.
2. The traditional Romance dialects spoken in Auvergne, Gascony, Rousillon, Limousin, and the southern Dauphiné, in contrast to the traditional dialect spoken in Provence.
[Medieval Latin Occitānus : Old Provençal oc, yes (from Latin hoc, neuter sing. of hic, this) + -itānus, adjective suff. (perhaps from (Aqu)itānus, of Aquitaine, Occitan-speaking region of France).]