Did you know Icelandic phone books are listed by first names (not surnames)

Icelandic phone books traditionally list people by their first names rather than surnames. This is because Iceland has a patronymic naming system, where a person's last name is derived from their father's first name.

Here's a breakdown of the Icelandic naming system:

First Name: This is chosen by the parents.
Patronymic: This is formed by adding "-son" (for sons) or "-dóttir" (for daughters) to the father's first name.
For example, if a man named Bjorn has a daughter named Anna, her full name would be Anna Björnsdóttir.

Since patronymics are not unique identifiers, especially with a smaller population, listing phone numbers by first name makes more sense in Iceland.