Do the characters in the game have full names? Now I'm thinking so much that I have a headache
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Only a few of them have been revealed I think, apart from the main protagonists. Bree Cheese in the female protagonist route (her surname can be changed) and Mike Seeker in the male protagonist route (both names can be changed). Cassidy's surname is Johnson since Dwayne's her father and that would be Cherie's as well since she married him
(and probably kept it after Dwayne is killed, while her maiden surname is unknown), Camila's surname is Foglio and that's revealed if the male protagonist goes to the police station to report Kylie
(for either stalking/rape/murder) and probably Minami (her surname would be Seeker if the protagonist's original surname is kept, the same would go for their father Dylan and mother Angela (her maiden surname is also unknown)). So far those are the only characters with full names known atm, perhaps the dev might reveal the other LI's surnames later on.