John, Johanna, Erastus Barry -Norway bef.1843

My great-great-grandfather Erastus Barry was born in Norway in May 1833 and immigrated, probably with his parents to USA about 1842. His parents were John and Johanna Barry, both listed on his death record as having been born in Norway. One record does list his nationality as Swede, others such as census records all say Norwegian. He was working as a clerk in a textile mill in Catskill, Greene County, New York as of 1850 census and was in New York City by 1860 where 2 sons were born, Erastus Payne Barry (Barrey) and Percy Payne Barry. Name is not typically Norwegian. I have not been able to discover any further details about place of birth or abode in Norway ? anyone have any suggestions ? Erastus Barry was an engineer.