Eureka (word)
"Eureka" comes from the Ancient Greek word "heúrēka", meaning "I found (it)", which is the first person singular perfect indicative active of the verb "heuriskō" "I find". It is closely related to heuristic, which refers to experience-based techniques for problem solving, learning, and discovery.
Bucca (mythological creature)
Use of the term Púka in Ireland, however, may predate the arrival of Norse settlers and could be an alternative origin of the word with considerable cultural exchange with Ireland occurring in the Early Christian era.