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n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.
Don't call her by her deadname. She hasn't gone by that name in years.
by Canola Yogurt September 16, 2014
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2
verb To refer to a trans person by their birth name, as opposed to their new legal name. (Usually done mockingly, or insultingly.)
"Some bouncers will deliberately dead name me after seeing my old name on my ID."
by Arizona Steve March 31, 2019
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3
Deadname is a word used to describe someone’s old name after changing it (usually a trans person)
Don’t call her by her deadname
by Devil123457890 February 24, 2020
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4
A deadname is a trans term only, for cisgender people its birth name and/or old name.

Trans being people under the trans umbrella (trans men, trans women, nonbinary, agender, non cis demiboys, non cis demigirls.)
He's trans and his name is now Elliot and you shouldn't deadname him.

Their deadname is unimportant since they prefer another name.

Her deadname got leaked and she's devastated.
by decayingteeth May 21, 2021
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