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!!!

Show Accepted Answer

Guest Quick Reply (No URL, BBcode or HTML)

Last post by schinner.keagan
2 hours ago
Last post by neha.jaskolski
3 hours ago
Last post by jheidenreich
5 hours ago
Last post by clockman
1 hour ago
Last post by michaela51
1 hour ago
Last post by freeda.ferry
3 hours ago
Last post by mona.schultz
3 hours ago
Last post by lilly.von
45 minutes ago
Last post by maiya54
2 hours ago
Last post by dbaumbach
1 hour ago
Last post by orval93
4 hours ago
Last post by santos85
2 hours ago
Last post by ghermiston
2 hours ago
Last post by orn.duane
3 hours ago
Last post by elizabeth.heaney
4 hours ago