A glance at this page - http://www.nom-famille.com/nom-dairon.html reveals a small Dairon presence in France today. I've also looked at the family search website and there was certainly a Dairon presence in Scotland, mainly Glasgow, in the 19th century. I would suggest a French origin and an individual or family migrating to Scotland in the 18th-19th century. Maybe a Huguenot family, or one with a mercantile connection with Glasgow. I've also noted a Frenchman named John Baptist Dairon married at Derby. This gent may have been a Huguenot refugee. There are websites occupied with Huguenot family history which could yield further information.