It’s an sailpoint displayName mostly the Account Name as @naresh_koorapati2 mentioned, which is set in account schema. This was the default correlation logic you can’t change this.
I heard from an IDN expert(who is not on this thread) that this “Name” is the Name that appears in the identity’s IdentityNow account. However, I am not sure why it is being used here, and any use cases around this concept would help me understand this deeply.