Unfamiliar contacts may be the result of automatic contact creation in your Gmail account.
- The best way to handle this is to clean them up in your Gmail account. Either delete or merge duplicates. Here is Gmail's article on merging contacts.
- Afterwards, re-sync the phone's Google contacts and run a Lookout Backup, which will remove them from your Lookout account.
For a deeper understanding, read on:
If you're noticing large numbers of unknown email address or phone numbers in your contact list, it is probably the result of Google's automatic contact creation in your Gmail account. When you sync your Google account, Android imports those contacts to your phone.
Whenever you reply to or forward an email in Gmail, Google automatically includes the email address(es) under "Other Contacts" in your account. Google tries to extrapolate the email address' owner, however it sometimes appears to be a completely random connection. When you activate an Android device and associate it with your Google account, Android automatically pulls those same contacts. In turn, when Lookout is backing up your Google contacts on your phone those random contacts are included as well.