It's often used in English words to indicate a positive quality or state.
Here are some examples:
* Euphony: Pleasant sound
* Euphemism: A mild or indirect expression substituted for one considered to be too harsh or blunt
* Euthanasia: The painless killing of a patient suffering from an incurable and painful disease or condition
* Eulogy: A speech in praise of someone who has died
* Euphoric: Feeling intense happiness and excitement
* Euclid: A Greek mathematician, known for his work in geometry