My great grandfather, Charles Carstens b. June 8, 1852 in Hamburg, Germany to Henry Carstens and Mary Loretta (I have seen both Mary and Loretta used separately and as one name) nee Autone(?). Charles left Hamburg February 1, 1870 on the Koreleone(? I can not find Charles on any ships listing) for the United States. He arrived in the USA on May 14, 1870. This information is taken from Charles' naturalization papers of 1917. In the July 6, 1870 Federal Census of New York City, Charles age 22 and a carpenter, is living with a Jacob Moore, a contractor and his family. The wife Eliza A., Nettie, daughter and Ada, daughter. By November of 1880 Charles is married to my great grandmother, Mary Monahan b. Ireland (info. from marriage certificate.)
My questions are:
Is it possible to get a birth certificate for my great grandfather in Hamburg?
Is the surname Autone a true German surname? If so, is it from the Hamburg area?
Are there others researching the surname Carstens? I would like to know if my great grandfather had siblings? If so did they or his parents come to the United States?
Any and all help is greatly appreciated,
Ro