Type Bilbo into a booking form and you may get nothing. Type Sopela and the metro appears, but the beach you were looking for is signposted Sopelana. Neither is a mistake: Bizkaia runs two naming systems at once, and only one of them is official.
Is it Bilbao or Bilbo? Euskaltzaindia sets Bilbo as the Basque form of the municipality, with the demonym bilbotar, while the official name is Bilbao, under rule 145 of 2005. In Sopela the official form is Sopela and the Spanish one Sopelana; in Areeta both are official, following a 1996 ruling.
Euskaltzaindia is the Royal Academy of the Basque Language, and its onomastic database EODA publishes the standard form of every place name in Bizkaia.
How the names sound, in short
Basque spelling is regular and nothing is silent, which makes these names easier to say than they look. Four letters carry most of the difficulty: tx is the ch of church, x alone is sh, z is an s rather than the Spanish th, and j is a y.
That makes Getxo GET-cho and Zazpikaleak Sas-pee-ka-LEH-ak, and it applies to Gaztelugatxe, Etxebarri and Axpe in the same way, since the rules hold wherever the letters appear rather than word by word. The letter-by-letter version, with the 1998 Academy rule behind it, is in the guide to how to say Getxo, Gaztelugatxe and Zazpikaleak.
Getting those four right matters mainly at a ticket desk or a bus stop, where a recognisable name works faster than a screen. For reading a sign, the words around the name matter more than the name itself, and those form a separate vocabulary of about a dozen terms: itxita for closed, doakoa for free of charge, ordutegia for the timetable and gunea for the fare zone.
Districts whose official name nobody uses
Inside a municipality the naming splits again, and the official district name is often not the one people say.
In Getxo, the district of Elexalde is officially Andra Mari, with Spanish signage reading “Barrio Elexalde”, which is the sort of mismatch that turns a fifteen-minute walk into a wrong bus. In Sopela, the administrative centre is Moreaga, with Sopela recorded as an alternative name. In Barakaldo, the centre is officially San Vicente de Barakaldo, with the Basque form Done Bikendi and the short Spanish form San Vicente on signage.
That is exactly why Getxo has seven metro stations and none of them is called Getxo: each carries its district name rather than the municipal one, as explained in the guide to Getxo from Bilbao.
Three labels, and only one of them is official
Any place here can carry up to three tags, and mixing them up is what makes a search fail. They are not synonyms competing for correctness: each one belongs to a different system, and each is right in its own.
The first is the standard Basque form, set by Euskaltzaindia. The second is the official name, used by the administration and on signs. The third is the Spanish form, which sometimes exists and sometimes does not.
Bilbao splits all three, according to Euskaltzaindia: the Basque form is Bilbo, the official name is Bilbao, and the demonym is bilbotar. Coastal towns keep their own demonyms, among them bermeotar, mundakar and bakiotar. The reference document behind the official list is the Bizkaia municipal nomenclature, rule 145, and the same database records the city centre sitting at just 10 metres above sea level.
Sopela works the other way round. The Basque and official forms coincide as Sopela, and it is the Spanish form, Sopelana, that stands apart. Its demonyms are sopelar and sopeloztar, and the administrative centre of the municipality is recorded not as Sopela at all but as Moreaga.
| Place | Official name | Spanish form | Altitude |
|---|---|---|---|
| Bilbao | Bilbao | Bilbao | 10 m |
| Mundaka | Mundaka | n/a | 5 m |
| Portugalete | Portugalete | Portugalete | 6 m |
| Gernika-Lumo | Gernika-Lumo | n/a | 12 m |
| Bermeo | Bermeo | n/a | 20 m |
| Areeta | Areeta / Las Arenas | Las Arenas | n/a |
Three names that catch English speakers out
Three cases account for most of the confusion, and each fails in a different way:
- Bilbo is correct Basque and will not always be recognised by a booking form, which indexes the official Bilbao
- Sopelana finds the beach but the station is Sopela, so a journey planner and a beach guide disagree by one syllable
- Las Arenas and Areeta are both official, so a sign showing only one of them is not an omission
None of the three is an error on anyone’s part. They are three different registers of the same place, and the one that matters depends on whether you are reading a sign, typing a search or asking a person. Getting it wrong costs a few minutes; knowing which register you are in costs nothing at all.
Checking a name, and which ruling governs it
The database, as published by Euskaltzaindia under the name EODA, records for each place the official form, the Spanish form where one exists, the demonym and the ruling behind it, and that last field is what makes a name traceable rather than merely plausible.
For municipalities in Bizkaia the reference document is the 2005 municipal nomenclature, rule 145. Individual opinions sit on top of it wherever a case has been revised repeatedly, as with Sopela or Bilbo, and each record names the ruling that applies to it so the decision can be traced rather than assumed.
The Academy adds a caution worth reading before treating any entry as settled: not every variant in the database is endorsed by Euskaltzaindia, since it also collects researchers’ proposals and commission publications. Each record states its level of standardisation.
Some names exist only in one direction. The coastal railway is registered as Bilbo-Bermeo trenbidea, with the Spanish equivalent “Ferrocarril Bilbao-Bermeo” and Euskotren as an alternative name, which is the line described in the guide to the Bilbao to Mundaka and Bermeo train.
What to write, depending on what you are doing
- Searching for transport → the official form: Sopela, Bilbao, Areeta
- Writing in English → Bilbao, Sopelana, Las Arenas are all understood
- Reading an institutional sign → the Basque form may appear alone
- Looking for a beach → Sopelana returns better results than Sopela
- Asking about a Getxo district → name the district, not the municipality
- Using a demonym → bilbotar, getxotar, bermeotar
Why this matters beyond spelling
The two languages are not decorative here. Much municipal and provincial documentation in Bizkaia is published in Basque first, and sometimes only in Basque, which affects opening hours, seasonal notices and event listings.
The practical consequence for a visitor is simple: when a search in English or Spanish fails to reach an official page, the same search using the Basque form often finds it. Museum notices, seasonal closures and festival programmes appear that way regularly, and the Basque version is frequently the only one online. Planning any of the trips in the guide to Bizkaia villages from Bilbao runs into that at least once.
Frequently asked questions about Basque place names
Is it Bilbao or Bilbo?
Both, in different registers. Euskaltzaindia sets Bilbo as the standard Basque form of the municipality, with the demonym bilbotar, and records Bilbao as the official name. In English and Spanish you write Bilbao.
Is the town called Sopela or Sopelana?
The official name is Sopela, set by Academy rule, and Sopelana is the Spanish form the same database records. The metro station is Sopela while the beach is still searched for as Sopelana.
Are Areeta and Las Arenas the same place?
Yes. The Getxo district carries a double official name, Areeta / Las Arenas, following a 1996 ruling by Euskaltzaindia’s onomastics commission. Signage may show either form or both together, and the metro station there uses Areeta.
Where can I check a Bizkaia place name?
In EODA, Euskaltzaindia’s onomastic database, which publishes the official form, the Spanish form where one exists, the demonym and the ruling behind it, such as the 2005 Bizkaia municipal nomenclature known as rule 145.
Do I need to speak Basque to travel around Bizkaia?
No, but recognising the two forms of a name saves time. Municipal and provincial pages are often published in Basque first, so searching the Basque form frequently returns an official timetable that the Spanish one does not.
Learn which name is official and the map stops contradicting the signs.