Hi, just came across your post,
Im also searching for Macks .... Im struggling a little with this side of my family.
My Great Granda was Robert Mack , he married Elizabeth Eleanor McWilliams in Christ Church Lisburn on the 12th July 1899 .... The record states that Robert Mack father was also called Robert Mack but thats as far as i can get.
I cant find a birth record for Robert who married Elizabeth in 1899 , they went on to have 9 sons the boys names were , Robert , Hugh , William, George, James, Henry, Samuel, Thomas and Albert.
Do any of these names ring any bells with anyone
The boys were all Baptised in Christ Church Derryaghy Lisburn ..... Another name that has come up is Mary J Mack 1871

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Begging for help with this search