Hey there! I'm now sure that my Cullen ancestors are from County Wexford. I visited my ancestor's gravesite and it says it on his headstone. I don't think we have any relation, because Patrick (the gravesite I visited) was born in Wexford and settled in the East Dubuque area. I think his wife Mary O'Brien was also born in Wexford. All of my Irish ancestors came straight from Ireland to either Grant, Dubuque, or Jo Daviess county. Good luck with the rest of your search though!