My family of Devlin's is Wesleyan Methodist. Family lore says 5 generations in the USA before 1847-8. There is some talk that My group of Devlin is related to David Livingstone through his mother a Hunter. I have not been able to find the link though.
The Livingstone's were of course Prostestant and that might be the connection. I did find a Mary Devlin as a servant in the household of David Livingstone's daughter Agnes'. perhaps that's where the conversion started.... Just musing here.
The methodists also seem to name their children's middle names with theirmother's maiden names. That's why we all have Lee in our middle names.