Family stories from the Alexander Devin line (youngest son of William Devin, Sr.) suggest the family came from the Alasc/Lorrine area of eastern France. The area was a center for the Protestants in the 1600s.
The family story that the Devin family were Huguenot refugees is a tread throughout several Devin families. However, no DNA matches have been found, yet, coming out out France. It could mean noone has tested, or all male members left France or died.
Do you have some primary evidence that William Devin, Sr. was born in Ireland?