The last names of the Icelandic are created through the very specific system of taking the first name of the child's father and appending "són" or "dóttir" as appropriate.

To take the example of the only Icelandic person anyone here is likely to have heard of, Björk Guðmundsdóttir is the daughter of Guðmundur Gunnarsón ("Guðmund's Daughter"), and has a son named Sindri Thorsson ("Thor's son"). (Thor, if you're wondering, was the guitarist for the Sugarcubes.)

There are, of course, examples out there of people choosing to buck the system and retain the surnames of their parents rather than naming their surnames after their parents; i'd imagine if you looked you'd find someone somewhere who named their surname after their mother. However lining this kind of thing patriarchally is the default and apparently not thought about much.

The whole thing is, i think, somewhat nifty, and certainly makes things less confusing in terms of working with Genealogy. (Iceland has, as it happens, a long tradition of producing Genealogy freaks.)

As a result of this rather unique relatively unique system, Icelandic phone books list people alphabetically by given name.

The system's not completely unique to Iceland: after all, it's how all the common English surnames in -son came about. "Robert Johnson" is (in origin) Robert John's son. But you'll notice we lose one of the two S's. But in Icelandic they both stay: Jónsson. The first S is from the genitive of the name. In English all genitives end in S. Not so in Icelandic.

Take the aforementioned Sindri. When he has children: in English we'd say Sindri's son, Sindri's daughter, with the internal S. But in Icelandic -i changes to -a, so if he has a daughter Anna she'd be Anna Sindradóttir.

The ending depends on the declension: it is not always -s. Björn becames Björns or Bjarnar. So if he had a son Sindri he'd be called Sindri Björnsson or Sindri Bjarnarson.

This patronymic system is used in various places in the world. The Bulgarian naming system is similar, and it was also used in Mongolia through most of the twentieth century.

Okay, I've been C!ed so I'd better add a word or two about Bulgarian and Mongolian. Neither uses the words son or daughter as Icelandic does.

In Bulgarian the suffix is -ov for a son and -ovna for a daughter (and -ova for a wife). Other Slavonic languages also use similar patronymics, but in Bulgaria they are newly created surnames each generation: Todor Zhivkov's daughter would be not Marina Zhivkovna (as they do in Czech) nor Marina Todorovna Zhivkova (as they do in Russian), but Marina Todorovna.

In Mongolian the father's name with the genitive -yn was prefixed: so Tsedenbal is called in full Yumzhaagiyn Tsedenbal, but neither part is his surname. However, this system is modern, since Mongolians did have surnames but these were abolished after the Communist takeover of the 1920s in order to break the traditional clan structure. From the 2000s Mongolian were once more required to adopt surnames, preferably their former ones if these could be learned from elders or records. For more details see for example:

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