Ten Prevalent Irish-American Surnames

1.) Murphy                                            6.)  Kelley (may be Scottish/English)
2.) Kelly (may be Scottish/English)      7.)  Burke
3.) Sullivan                                            8.)  Riley
4.) Kennedy (often Scottish)                  9.)  O’Brien
5.) Bryant                                              10.)  McCoy
 

Ten Prevalent German-American Surnames

1.) Myers                                                  6.)   Schwarz
2.) Schmidt                                               7.)  Schneider
3.) Hoffman(n)                                         8.)  Zimmerman(n)
4.) Wagner (sometimes English)              9.)  Keller
5.) Meyer                                                  10.)  Klein

Ten Prevalent Italian-American Surnames

1.) Russo                                           6.)  Costa (may be Spanish/Portuguese)
2.) Lombardo, Lombardi                  7.)  Luna
3.) Romano                                       8.)  Rossi(ni)
4.) Marino                                         9.)  Esposito
5.) Lorenzo (sometimes Spanish)   10.)  Gallo

Ten Prevalent Scandinavian-American Surnames

1.) Anderson                                     6.)  Hansen
2.) Peterson                                       7.)  Carlson
3.) Nelson                                         8.)  Larson
4.) Christianson                                9.)  Erickson
5.) Olson                                         10.)  Swanson

Ten Prevalent Spanish-American Surnames

1.) Rodriguez                                    6.)  Martinez
2.) Gonzalez                                      7.)  Hernandez
3.) Garcia                                          8.)  Perez
4.) Lopez                                           9.)  Sanchez
5.) Rivera                                         10.)  Torres

Ten Prevalent Welsh-American Surnames

1.) Williams                                6.)  Evans
2.) Jones                                      7.)  Rogers
3.) Davis                                      8.)  Morgan
4.) Thomas                                   9.)  Hughes
5.) Lewis                                    10.)  Price