Why does my android phone keep removing the names of some of my contacts?

My phone is a Samsung Galaxy J7 Crown, July 1st, 2018.
For some reason, three of my phones contacts keep removing the names. It gets annoying because, I keep having to go in to their settings and give them a contact name, then the next time I go into my phone messages, the names are gone AGAIN!
I'm getting tired of it. Please help!!!

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