How to get Photos to recognize/suggest faces for People?

Hello Alexroett,

Thank you for reaching out to Apple Support Communities.

These steps may be able to help:

"Combine photos of a person into one group

If you find more than one group of photos that identify the same person, you can combine the groups. 

1. In the Photos app  on your Mac, click People in the sidebar.
2. Select the groups of photos that you want to combine.
3. Control-click one group, then choose Merge [number] People. 

Manually identify and name people in a photo

Some photos may contain people who are not automatically named. You can name them manually.

1. In the Photos app on your Mac, double-click a photo to open it.
2. Do one of the following:

• Choose View > Show Face Names. Click the name (or click “unnamed”) under a face, type a name, then press Return (or choose a name that appears as you type).
• Click the Info button in the toolbar. Click the Add button, drag the circle to position it over the face if necessary, click the Name field, type a name, then press Return.
  • You can click the Add button multiple times to identify multiple faces in a photo. To remove a name that you added to a face, click the Remove button on the person.

To stop showing face names in photos, choose View > Hide Face Names."

More details can be found here: Find and identify photos of people using Photos on Mac

Cheers!