There is no definitive etymology for the word "steakfish" because it is not a recognized English term. "Steak" refers to a type of meat, usually cut from beef, and "fish" refers to aquatic creatures. It is possible that "steakfish" is a combination of the two words to refer to a specific fish species that is known for having meaty or steak-like qualities, but this term is not widely used or recognized in the English language.