Use requester's name (only) as a trigger condition to set assignee

I need a way to automatically set a particular assignee to tickets based on the requester's name (end user, not a team member). I am aware of the recommendation below (to create a unique tag in a user's profile, and then use that tag as a trigger condition) - however I need my condition to be based only on the requester's name, regardless of email address, because their email address can change.

https://support.zendesk.com/hc/en-us/articles/223512968-Can-I-automatically-route-tickets-from-a-specific-customer-to-specific-agent-

Is there any way of doing this on Zendesk only, without using the API? Or can this only be achieved using the API?

Thank you!