Family name Diddock (Diddock 
) , around the world, is a very rare cognomen. The cognomen Diddock is habitual in Northern America, particularly the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Diddock | United States |
| marguerite laflesche diddock Omaha Reservation educator, US (b. 1862) |
|