Yes, because they speak Spanish. But you call it Spanish, not "Español". That's the point. There are perfectly fine English words for what the Spanish call "Es

Yes, because they speak Spanish. But you call it Spanish, not "Español". That's the point. There are perfectly fine English words for what the Spanish call "Español" ("Spanish"), and what the Germans call "Deutsch" ("German"), and what the Indonesians call "Bahasa Indonesia" ("Indonesian"), and what the French call "Français" ("French"), and what the Chinese call "普通话" ("Mandarin"), and what the Persians call "Farsi" ("Persian").