* It's a misspelling: It might be a misspelling of a word like "Hermes," which is a Greek god.
* It's a foreign word: It could be a word from another language.
* It's a made-up word: It could be a fictional word created for a specific purpose.
Could you please provide more context? What was the situation where you encountered this word? This will help me determine what "Hermeso" might mean.