When typing on the LG keyboard, you can suggest not only words but also contacts, and the contact suggestion must be enabled through the keyboard settings, which must also accept access to the contacts.

Android 9 | LG UX 9.0
Suggest contacts -  Open the  Settings
Suggest contacts -  Tap on  General
Suggest contacts -  Tap on  Language & keyboard
Suggest contacts -  Tap on  On-screen keyboard
Suggest contacts -  Tap on  LG Keyboard
Suggest contacts -  Tap on  Word suggestions
Suggest contacts -  Tap on  Update word suggestions
Suggest contacts -  Enable or Disable  Contacts
  1. Open the Settings
  2. Tap on General
  3. Tap on Language & keyboard
  4. Tap on On-screen keyboard
  5. Tap on LG Keyboard
  6. Tap on Word suggestions
  7. Tap on Update word suggestions
  8. Enable or Disable Contacts

LG Instructions
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