Help requested with my brick walls
I have been working on the genealogy for the parental (McDonnell/McDonald) side of my family and am now stumped in several areas. Here is a summary of what I found so far: My great grandfather was born Michael McDonnell in County Mayo, Ireland, in November 1862. His father and mother, Patrick McDonnell and Bridget Malone McDonnell, were also born in Ireland. He was born in either 1840 or 1843 and she was born in 1845. They emigrated to the US in 1862 where their last name was changed to McDonald. They lived in Schuylkill County, Pennsylvania, once they reached the US. I do not know where they departed from nor where they arrived. I am unable to find their names on the ships’ manifests I found online.
Patrick’s father was James McDonnel who was born in July 1829 according to my research. I believe James’s married Mary Laffy in 1843. From what I have found online, James’ father was also named Patrick, and his mother was named Mary. I found evidence using Griffin’s Valuation that James and his son Patrick both leased land to farm in Liscarney, County Mayo, prior to Patrick departing for the US. I also found James’ Church Baptism record showing his address as Teevenish in the Parish/District of Aghagower RC parish. This record shows Patrick and Mary as his parents. The Sponsor/Informant was James McDonnel (Patrick’s brother?). Please note that the spelling of the last name varies between 1 and 2 Ns and 1 and 2 Ls throughout my research. This is where I hit a dead-end. I cannot find any information on my 4x great grandfather, Patrick. Additionally, I cannot find any information on other children James and Mary had.
Any help you can give me to remove my roadblock, is appreciated.

