deadlastname
A last name, just like deadname, is last name, that isn't used anymore by a person, and can be used by both cis and trans people for private reasons(e.g. past)
Person A: Ohh, so that's their deadlastname?
Person B: Yes, but please, use their current lastname. They are very uncomfortable with their deadlastname
Person A: Alright!/gen
Person B: Yes, but please, use their current lastname. They are very uncomfortable with their deadlastname
Person A: Alright!/gen