You can't lawsuit a parody or clones! or Cinema & shooters would be out of business tomorrow, look at the Battle Royale clones. If something was called Friday The 14th it could sound more authentic as its using a different name because its a video game. Change the characters name & make him a cop with a Hockey mask, Writer doesn't copyright cops or Hockey masks, you need to fight smart against this BS. It amazes me to think the developers didn't think they needed permission, even back in The Atari days people knew this, they just allowed them to make games without a copyright license because they weren't interested in the 80's and seen it as free exposure.
Jaws could have saved their entire franchise doing something similar in my original opinion, the movie was called Jaws after all not Shark, Jaws3 could have been about different species and it would have always seemed fresh and new. & anyone with the cash could have ripped it off BIGTIME in the 80's. See! my ideas are always great. Jaws3 could have been an Anaconda.
Call it Friday The 14th make him a cop wearing a hockey mask around a Loch, and the lawyers can't touch you.