Alucard is a common vampire name in fiction. As many know, it is Dracula spelled backwards, and is usually used either as a disguise for Dracula, or to signify some sort of relation to Dracula.
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When Alucard is Dracula, this is a subtrope of Sdrawkcab Alias. Otherwise, this is a subtrope of Sdrawkcab Name. Commonly, the Alucard turns out to be Dracula's son, though it's just as likely that Alucard and Dracula are not relatives. Compare contrast Louis Cypher where other dark creatures use similarly witty aliases and Hugh Mann where the creature posing as human also has a Paper-Thin Disguise. Related to Most Definitely Not a Villain.