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Calling a trans person by their former name is referred to as "deadnaming" and is considered highly offensive to most trans people I know.

"Civilities: Steven Petrow answers all your LGBT and straight social dilemmas for the hour". The Washington Post Live Chat, live.washingtonpost.com. September 13, 2016.
Calling a trans person by their former name is referred to as deadnaming and is considered highly offensive to most trans people I know.