Posted on 10th August 201629th July 2016 by melyn ‘Good day’ in Cornish is ‘Dydh da!’ Yes, if you want to say ‘Good day’ in the Cornish language, it’s ‘Dydh da!’. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Meur is the Cornish word for greatNext post: Fondya is the Cornish word for found