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Surname Isleifur (Isleifur
) , in all the world, is an extremely rare cognomen. Much more frequently, Isleifur is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Isleifur | Iceland, United States |
Leifsson, Thorsen, Ottesen, Gissurarson, Thorhallsson, Ingimarsson, and Gudmundsson