How do I get this creep to stop contacting me?

A friend tried to play matchmaker and gave this guy my number. I met him, had a coffee with him, and red flags were waving right away (he seemed overly needy and desperate) so I blocked his number. That was 2 years ago. Ever since then he has been stalking my social media. I messaged him to stop contacting me. I have a fiance and a baby now. I have had to change my name on social media to a nickname and fake last name, as well as not use face pictures. Now he's stalking me on LinkedIn. Everytime I block him, he creates another account. I would delete my LinkedIn except I'm job hunting and I don't want to have to do that. What gets creeps like this to stop?
How do I get this creep to stop contacting me?
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