The universities of Rennes and Brest in Brittany have degrees in celtic;
most is Breton language, but there are also courses in Welsh and Irish
Celtic is also taught in Paris (Ecole des Hautes Etudes), mostly medieval.
There is an Erasmus exchange scheme (staff and students) on Celtic languages
andf cultures, grouping 12 universities (UK, Ireland, Germany, France,
Netherlands, Norway, Finland...).
Hope this helps you.