I found the following info in the 1880 Bridgeport Connecticut census.

Father THOMAS J. SYNNOTT -- Pastor of St. Augustine's RC Church in Bridgeport Connecticut.
Age: 52
Birthplace: Ireland
Birthplace of parents: Ireland

Father JOHN SYNNOTT -- Associate Pastor of St. Augustine's in Bridgeport CT.
Age: 29
Birthplace: Canada
Birthplace of Parents: Canada (which may not be accurate, at least for the father of John).

Fr. John SYNNOTT is the nephew of Fr. Thomas J. SYNNOTT.

One or both of the Synnotts is buried at St. Augustine's.

Does this connect with anyone?