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Thanks to all for the responses/information. My Sinnott branch descends from a Patrick Sinnott who married  Alice Hore & began to have children in 1782. They had 17 children between 1782 and 1805. Many of the names listed in the 1894 directory appear to be family names but of later generations. Slater's National Comm'l Directory of 1846 list several family names in the grocery and leather setter business while Griffith's Valuation identifies a Sinnott compound in St. Johns that appears to include a number of related families.  One of the 17 children, Alexander bn. 1799 married Sally(or Sarah) Currin in March of 1824 and they had 4 children: Patrick bn 1825, John bn 1828, Nicholas bn 1830 and Sarah bn 1833. Patrick went to Baltimore in the USA in 1854 as did John. Patrick married Mary Bolger in February 1854 and they had one son John T or P. John and his wife arrived in Baltimore after Patrick and had both contracted ships disease which the subsequently gave to Mary Bolger who also died. Patrick remarried in Baltimore to Catherine Henry and they had 4 or 5 children.
I don't know if any of this helps but I hope someone in Wexford might read it and recognise the history.

Thank you for the information. Sinnott is a fairly common name in southeastern Ireland. I should have been more specific in my request that the Sinnott family I am most interested in is that of Alexander Sinnott who had 4 children including my Great Grandfather Patrick Michael. I know that three of the four went to the US. One, Nicholas may have remained in Ireland. Alexander's father was named Patrick and maried Alice Hore. They had 18 children thus adding a lot to the Sinnott population in Wexford.
Do you have an interest in this family line or simply being helpful? Please let me know and thank you again. What I am looking for is someone knowledgable on this family in Ireland who could help me learn more.