A lot of guesswork has been done on the surname Cady. The latest Y-DNA evidence (on FamilytreeDNA.Com) points to the name coming from Viking origins. The Vikings who settled in East Anglica, spoke a language similar to that spoken in Denmark and Southern Sweden after 900. What is odd is that this language had no “C”, it did have the “Ka”. The name seems to have a common ancestor born after 1066. In the period the languages spoken were Middle English, Anglo-Norman and Latin. The surname comes from East Angelica of which Suffolk was part. The name appeared in written records in early Edinburgh, York, and Suffolk. It was reported in the Census of 1851 in several Counties, but heaviest in Suffolk. With this little information, we can cross off several claims as to it’s origin. It is not Scottish, Welsh, or Irish. It was not likely to be from Wessex (Western England), so it is not related to Cadbury or any Germanic surname, The only name left that had not been eliminated is Cade, which is has been often confused. The only point I can clarify was that Cade was thought to be from a French wine cast ot a domestic animal kept as a pet. I believe the spelling might be the same but pronounced differently (Cad, Ka-dee, Ka-id)