This is the 7255th most frequent Polish word.
juan
In Polish, "juan" refers to the Chinese currency unit, yuan.
In this sentence, 'Juan' is used as a proper noun, specifically a personal name, often associated with Spanish-speaking individuals.
Juan jest bardzo miłym człowiekiem.
Juan is a very kind person.
Here, 'juan' is being creatively used in a playful or poetic way as an alternative form of 'już', which means 'already'. However, note that this usage is not standard Polish.
Obiad juan będzie gotowy za godzinę.
Dinner will be ready in an hour.
In this instance, 'Juan' is used as the title of a book, clearly distinguishing it as a specific subject mentioned.