How to Say "either one" in Spanish
The Spanish word for “either one” is “cualquiera” — B1 level. This is a very common word in everyday Spanish.
Examples
Cualquiera puede aprender español.
Anyone can learn Spanish.
Pregúntale a cualquiera, todos lo saben.
Ask anybody, everyone knows it.
Cualquiera de los dos vestidos te queda bien.
Either one of the two dresses looks good on you.
Using with 'que'
When you use 'cualquiera que...' to talk about a hypothetical or unknown person, the next verb often takes a special 'subjunctive' form. For example, 'Cualquiera que pueda ayudar...' (Anyone who might be able to help...).
Using 'alguien' instead
Mistake: “'Alguien' means 'someone' (a specific, but unnamed person). 'Cualquiera' means 'anyone' (it doesn't matter who).”
Correction: Use 'Alguien llamó' (Someone called). Use 'Cualquiera puede llamar' (Anyone can call).
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