Hi Danishdots,
I have access to do lookups in the Catholic records for Raheen Parish and can confirm that there are not Deverells (or variants) recorded in either the Baptismal or Marriage Registers.
For the earliest generation that you DO know about, where were they living, what parish were they in and what religion were they? All of this would help us to narrow down the possibilities for you.
Good luck with your research - I hope it is fruitful.
Susan