Family name Hálfdanarson (Hálfdanarson 
) , globally, is a very rare last name. The family name Hálfdanarson is characteristic of Northern Europe, particularly Iceland, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Hálfdanarson | Iceland |
| helgi hálfdanarson (b. 1826) |
|
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| helgi hálfdanarson Icelandic translator, IS (b. 1911) |
|