Last name Didac (Didac 
, Dídac 
) , in the world, is quite a rare surname. The last name Didac is habitual in Spain, where it is quite a rare surname, New Zealand, where it is a very rare surname, and Chile. In absolute terms, it is commonest in Spain, Canada, and the United States. More prevalently, Didac is the forename as well as the last name.