Dennis McCoy

I am looking for information on my 4th great grandfather Dennis McCoy. He was born in County Cork, Ireland in March 1806. He was a seaman and as a youth he worked in the sail boat yards. He married Hannah Gallagher in 1844. Hannah was born in County Donegal, one of three triplets, all girls, in May 1819. Dennis and Hannah immigrated to the United States in 1847. He is my last McCoy decendant that I can trace to and I am looking for information on his parents and back!

Thank you :)

Kathy