I was wondering if there is a way to add a contact with phone/mail but without the actual name

We're active in real estate. During prospection, in some cases you found/have the phone number or mail but not an actual name. However, when adding a contact to a deal, a name is an obligated field. 

Consequently, our agents put in a preliminary X or intials as a name for now. I'm sure this will cause duplicate problems, data pollution etc. 

In the settings, data fields, I have not indicated the Contactperson's name as Required: https://share.getcloudapp.com/p9uGGmnw

Any ideas how to solve this WITHOUT preventing a bunch of 'generic' X or ABC contact names? https://share.getcloudapp.com/4gu99pDm