Shaw "Mac-in-Toisich" MacDuff, 1st Chief - Primary Sources?

By Celtus (Celtus @ english wikipedia) - Own work by uploader. The cat element is adapted from an out-of-copyright book (Fairbairn's crests of the leading families in Great Britain and Ireland and their kindred in other lands, 1911)., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5109515