Posted on 21st October 201721st May 2017 by melyn Siw is the Cornish word for bream Yes, bream in Cornish is siw Photo by zimpenfish Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Gwelesigeth is the Cornish word for visionNext post: Gocki is the Cornish word for daft