First names for Halfdan
- Harry Halfdan 4
- Halbirk Halfdan 2
- Tryggva Halfdan
- Thomek Halfdan
- Ragnar Halfdan
- Michael Halfdan
- Mary Halfdan
- Martin Halfdan
- Jotun Halfdan
- Heimdall Halfdan
- Dresden Halfdan
- Dagny Halfdan
- Bjorn Halfdan
- Bjarte Halfdan
- Axedan Halfdan
- Ann Halfdan
- Afri Halfdan