Thorfinnsson
Thorfinnsson is an Icelandic patronymic surname. Notable people with the surname include:
- Björn Thorfinnsson, Icelandic chess player and journalist
- Bragi Þorfinnsson, Icelandic chess grandmaster
- Paul and Erlend Thorfinnsson; Paul and Erlend ruled together as Earls of Orkney
- Snorri Thorfinnsson, the first European to be born in North America