Basque name formation?

I was looking at the web page of this Basque cyclist ...

http://www.eneritziturriaga.com/biografia_eusk.php

.... and started wondering about how Basque names are formed. The name
she usually goes by is Eneritz Iturriaga, but her full name according
to this site is Eneritz Iturriagaexteberria Malaga.

I would guess (just a guess) that Malaga is her mother's family name,
similar to the way Castilians form names, but what about
Iturriagaexteberria? Where does the -exteberria part come from? I
know Exteberria by itself is a common Basque name. But why is it
attached to her "normal" surname?

.

Relevant Pages

  • Re: Basque name formation?
    ... she usually goes by is Eneritz Iturriaga, ... While I'm at it, her mother's surname, Malaga, doesn't seem to be Basque, ... but rather comes from the city of the same name in the far south of Spain. ... According to Wikipedia, it's Phoenician. ...
    (sci.lang)
  • Re: Basque name formation?
    ... she usually goes by is Eneritz Iturriaga, ... While I'm at it, her mother's surname, Malaga, doesn't seem to be Basque, but rather comes from the city of the same name in the far south of Spain. ... According to Wikipedia, it's Phoenician. ...
    (sci.lang)
  • Re: Basque name formation?
    ... she usually goes by is Eneritz Iturriaga, ... In the Basque country, houses have names, and the overwhelming majority of Basque surnames are the name of the family house of an ancestor, or of a location where an ancester lived. ... And, as as also happens in English, she often abbreviates it by leaving off the second component "for short". ...
    (sci.lang)
  • Re: Basque name formation?
    ... surname somehow, as is not uncommon in English and other Western European ... Basque equivalents to double-barrelled sunames unite them as one word. ...
    (sci.lang)