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Rex \rex\ as a boy's name is pronounced reks. It is of Latin origin, and the meaning of Rex is "king". Mostly 20th-century use. Actor Rex Harrison, film critic Rex Reed. Rex has 1 variant form: Reyes. For more information, see also the related name Rey. Baby names that sound like Rex are Regis and Rochus. View a list of the 2 names that reference Rex.

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