The Keddy Coat of Arms is officially documented in
Burke's Encyclopedia of Heraldry
HOW AN EARLY KEDDY WAS GRANTED A COAT OF ARMS
Since the early 13th century, Coats of Arms and Heraldry have been a source of great fascination as well as a subject of true historical importance. Researching the Keddy Coat of Arms is associated primarily with European medieval culture and has been recorded in heraldic archives. Germany, France and Italy have no current heraldic system. There are approximately 100,000 English arms, including Wales and the six northern Irish counties, on the rolls of the Royal College or Arms in London. The Scots maintain their own heraldry, governed by their own tradition and rules.
Under most heraldic rules, only first sons of first sons of the recipient of a Coat of Arms are permitted to bear their ancestor's arms. Younger sons may use a version of their father's arms, but the rules of heraldry say that they must be changed somewhat.
Our research indicates that there was undoubtedly more than one Keddy Coat of Arms. The earliest for Keddy which we could find was described as follows and became unique to an early Keddy: "Ar. three piles issuing from the chief engr. gu. the centre one charged with a crescent of the field." When translated the blazon also describes the original colours of the Keddy arms as: "Silver, three red triangle engrailed issuing from the top, points downward, the center one charged with a silver crescent." Above the shield and helmet is the crest which is described as: "A lancet, open, naturally coloured."
I still haven't positively made a connection of our Keddy ancestry to either England or Scotland and the Latin motto "OPIFERQUE DICOR PER ORBEM" translated means "I am called a bringer of help throughout the world."