I've been waiting for someone to post a query about DEYELL [and various spellings] from Co. Cavan, Ireland. There were several families living there in the 1800's. I think that at least one of them went to New Zealand.
The ones that I have come across were either Presbyterian or Church of Ireland.
While I don't have this surname in my family, I'd be willing to help anyone with Deyell ancestors who you are sure were from Co. Cavan.