I cannot help with Ireland but I can take Sarah back some more.

The father of William Czntrell, was Christopher, already age over 45 in 1810, supposdly born 1750 in Virginia. He was in Montgomery County, Ky in 1800 and 1810.

William and Malinda were with Robert (separate households) in 1870 Siskiyou County, CA and 1880 Modoc County. They were ages 72 and 62 in 1880.