Stop automatically merging contacts
By default, your BlackBerry device automatically merges contacts when it's clear that those contacts are the same person
(for example, they share the same first and last names, mobile phone number, BlackBerry ID, and so on). You can choose
whether or not you want your device to merge your contacts automatically.
In the Contacts app, swipe down from the top of the screen.
Turn off the Automatically Merge Contacts switch.
Tip: If you also want to unmerge your existing contacts, turn on the Unmerge Existing Contacts switch.