Hi Robert,
I was interested to see that you believe your Snoddens originated in Newtownards, County Down, Northern Ireland.
I am from Newtownards and I've just discovered that one of my 3xgreat-grandmothers was Sarah Snodden. She was the daughter of Alexander Snodden (Weaver) of Queen Street Newtownards, and she married James O'Neill (Weaver) of Greenwell Street Newtownards in June 1857.
The only child of that marriage that I am aware of was my great-great-grandmother, Isabella O'Neill, born in 1859, who married George McIlroy (Weaver) in 1875. The McIlroys had 3 chidren, (my great-grandmother) Sarah, Willie and Mary Jane, the last of whom (Willie) died in 1959.
When Sarah died, James O'Neill married Mary Jane McConnell in 1869 and had a further 6 children, the last of whom died in 1957.
If you think there might be a connection to your Snoddens please get in touch.