NINE NAMES
Spain has 52 provinces
Across all 52, only nine different surnames are ever the commonest one. We counted the official INE file, census date 1 January 2025.
The system is meant to tell people apart.
35 OF 52
Garcia tops almost everything
Garcia is the commonest first surname in 35 of Spain's 52 provinces. It is held by 1,446,937 people, or 29.45 in every 1,000 residents.
The other eight share the remaining seventeen.
17.3%
Ten names, a sixth of Spain
The ten commonest first surnames cover 17.3% of the country. Widen it to a hundred and you have 36.5% of all 49,128,297 residents.
One hundred names, more than a third of the population.
1 IN 257
The identity system that does not
Pick two Spaniards at random. The chance they share a first surname is at least 1 in 257, counting only the hundred commonest names.
The real odds are shorter than that.
23 OF 100
Half of them mean son of
Twenty three of Spain's hundred commonest surnames end in -ez, which once meant son of. Together they are 18.1% of everyone in Spain.
Rodriguez was Rodrigo's son. Sanchez was Sancho's.
34.5 vs 7.7
Geography changes everything
In Asturias, ten surnames cover 34.5% of the people. In Lleida, ten surnames cover 7.7%. Seventy Asturians in every 1,000 are called Fernandez.
More than a fourfold gap inside one country.
48 OF 52
A surname is a map of the past
Surnames cluster harder by province of birth than by province of residence in 48 of the 52 provinces. Migration has been blurring the picture for decades.
It says where a family started, not where it lives.
11.1%
The law changed. Habits did not.
Since 30 June 2017 parents must choose which surname goes first. Only 11.1% of children born since then carry the mother's name first.
Nearly nine births in ten kept the old order.
FIVE
Marriage is not on the list
Article 53 of Ley 20/2011 lists five grounds for changing your surnames by declaration. Marriage is not one of them, so a Spanish woman keeps her name for life.
Your surnames come from your parents, not your spouse.
SORTEO
Argentina and Chile draw lots
If Argentine parents cannot agree the order, article 64 says it is decided by sorteo at the civil registry. Chile does the same. Spain hands it to an official instead.
Two countries settle a child's name by lottery.
APELLIDOS
Always ask in the plural
Spanish forms ask for your apellidos, not your apellido, because they expect two. If you only have one, say solo tengo un apellido, and never hyphenate it.
Tap through for the full count and the tables.