Worldwide, Hálfdan (Hálfdan 
) is an extremely rare unknown gender first name.
| VARIANT | COUNTRY |
|---|---|
| Hálfdan | Iceland |
| hálfdan sæmundsson (1218-1265) (b. 1218) |
|
|
| hálfdan narfason Icelandic priest (b. 1550) |
|
|
| hálfdan einarsson IS (b. 1732) |
|