Yes especially if your last name is a little unique.

1. Create a new group (say ‘Brito’) as described above

2. Tap on that ‘Brito’ group from the home screen

3. Tap on the pencil icon on the top right to edit the group

4. Tap the ‘search’ icon on the top right and enter ‘Brito’ and then tap ‘search’ on the keyboard. [If most of them happen to live in town or city, search by that town name instead > Select All > Deselect individually the few who are not family]

5. Tap ‘Select all’

6. Tap ‘Update Group’

Alternatively, you can search for individuals by name and select them individually and update the group.