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This means that when a person is named, their last name is the name of their father, plus -sson. So if a man called Eric had a son called Leif, Leif's name would be Leif Ericsson.
The same is true for females, although sometimes women take the name of their father for their last name, or the name of their mother. Also, the suffix -sdottír is added to the end of the parent's name. So, if a girl called Astrid's parents were Leif and Inga, then their daughter could be called either Astrid Leifsdóttir, or Astrid Ingasdóttir.
This is naming system is the same naming system that was used by the Vikings. Iceland has kept this naming system because Iceland is an island, and had little contact with the outside world for quite some time, so there was not much change in things like customs, language and naming systems.