I found Mr Dairon in the local cemetery and was intrigued by the name(although anyone who's not a Mc or Mac stands out!) and was wondering about his origins. Sadly he doesn't seem to have had any lasting fame though I found a reference to an obituary for him and some other documents so he seems to have done well enough in his time. Anyway, thank you for your help. I was thinking it may perhaps be an imported Norman surname so Airon-Saint-Vaast is certainly plausible.