Let's talk about gentilicios (demonyms)! Gentilicios are words that we use as adjectives when we want to say the place where someone or something comes from. Some examples of demonyms are words like “Brazilian,” “African” or “Chinese.”
Unlike English, we don’t capitalize demonyms in Spanish:
Mejor dicho, esas que son una mezcla entre peruana y colombiano.
In other words, those that are a mix between a Peruvian girl and a Colombian guy.
Caption 35, La Sub30 - Familias - Part 1
We form demonyms using suffixes, which most of the time need to be consistent with the gender and the number of the noun they are describing. Let’s take the suffix ano:
Roberto es mexicano | Roberto is Mexican (singular masculine)
Claudia es mexicana | Claudia is Mexican (singular feminine)
Roberto y Claudia son mexicanos | Roberto and Claudia are Mexicans (plural masculine)
Claudia y Daniela son mexicanas | Claudia and Daniela are Mexicans (plural feminine)
cuando realmente veo otros mexicanos, otros latinos,
when I see other Mexicans, other Latin people,
Caption 57, Arturo Vega - Entrevista - Part 5
Other suffixes that are very often used to form gentilicios are és (singular masculine) and esa(singular feminine) as well as co (singular masculine) and ca (singular feminine):
De padre austriaco y madre francesa, es casi políglota de nacimiento.
From an Austrian father and French mother, he's pretty much multilingual from birth.
Caption 12, Europa Abierta - Alejandro Hermann - El arte de pintar
We also have the suffix eño (singular masculine) as in limeño (from Lima, the capital of Peru), and the suffix í as in the demonym iraní (from Iran). The latter is used for both masculine and feminine and only changes in its plural form (iraní becomes either iranís or iraníes, both forms are correct):
o madrileño, madrileña, de Madrid, la capital de España.
or "madrileño," "madrileña," [from Madrid], from Madrid, the capital of Spain.
Caption 34, Carlos Explica - Geografía y gentilicios
Just like iraní, the demonym estadounidense (from the United States) is the same for the masculine and feminine forms. Some people use americano or americana when referring to someone from the US. However, if you are travelling across Latin America try to use estadounidense instead. Most people in Latin America treat the word América as a continent and not a country so using that demonym when referring to the US will certainly leave a nice impression across the Americas.
That's all for now. We would like to leave you with the following exercise: Choose 20 countries from the world and try to write the gentilicios for each one. And don’t forget to send your feedback and suggestions to firstname.lastname@example.org.