It's possible that:
* It's a misspelling: There might be a similar-sounding name that you're thinking of. For example, "Freeswick" could be a typo for "Freewick", which is a surname found in England.
* It's a fictional name: It could be a made-up name from a book, movie, or game.
* It's a unique family name: While not common, it's possible that "Freeswick" is a very rare surname with an unknown origin.
If you have more context about where you encountered this name, it might be easier to determine its origins.