Family name Guiscard (Guiscard 
) , in the world, is an extremely rare cognomen. Predominantly, Guiscard is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guiscard | Germany, France, United States |
| antoine de guiscard French refugee (b. 1658) |
|
|
| catherine de guiscard 1687 - 9 Jul 1723 Auteuil (b. 1687) |
|