| 100% | MAHAL | 5 | Last name of father-daughter singers Taj and Deva |
| 61% | ONEAL | 5 | Last name of father-and-daughter actor Ryan and actress Tatum |
| 56% | ARKIN | 5 | Last name of father-and-son actors Alan and Adam |
| 56% | GRIESE | 6 | Last name of father-and-son quarterbacks Bob and Brian |
| 54% | ALDA | 4 | Last name of father/son actors Robert and Alan |
| 54% | ALI | 3 | Last name of father-and-daughter members of the International Boxing Hall of Fame |
| 54% | STILLER | 7 | Last name of Jerry and Ben, acting father and son |
| 54% | ONEAL | 5 | Last name of actor Ryan and his daughter, actress Tatum |
| 53% | OCEAN | 5 | "Watery" last name of singers Frank and Billy |
| 52% | GIBB | 4 | Last name of Bee Gees singers Barry, Maurice, and Robin |
| 52% | BUSH | 4 | Last name of father-and-son US presidents |
| 51% | MORA | 4 | Last name of father-and-son N.F.L. coaches |
| 48% | BUSH | 4 | Last name of former First Daughters Jenna and Barbara, who now live four blocks apart in New York City |
| 46% | ADKINS | 6 | Last name of singer Adele |
| 46% | OBAMA | 5 | Last name of Sasha and Malia |
| 46% | BAGGINS | 7 | Last name of Frodo and Bilbo |
| 46% | PRESLEY | 7 | Last name of singer Elvis Aaron __ |
| 46% | ORA | 3 | Last name of Anywhere singer Rita |
| 45% | GIBB | 4 | Last name of the "Night Fever" singers |
| 45% | ALI | 3 | Last name of boxers Muhammad and Laila |
| 45% | OBAMA | 5 | Last name of teenagers Malia and Sasha |
| 45% | COEN | 4 | Last name of filmmakers Ethan and Joel |
| 45% | GALLO | 5 | Last name of winemakers Ernest and Julio |
| 45% | COEN | 4 | Last name of filmmakers Joel and Ethan |
| 45% | LEE | 3 | Last name of filmmakers Spike and Ang |
| 45% | MILLER | 6 | Last name of Sienna, Ezra and Wentworth |
| 45% | MARA | 4 | Last name of actresses Rooney and Kate |
| 45% | CRANE | 5 | Last name of TV's Niles and Frasier |
| 45% | TAM | 3 | Last name of Simon and River, on "Firefly" |
| 45% | OLSEN | 5 | Last name of twins Mary-Kate and Ashley |