Alpha Lorenzo Walker and Tamara Eileen Diaz threatened to reveal “embarrassing information” about the star, officials in Los Angeles said.
Both deny the accusations and are in custody awaiting a preliminary hearing on 16 May.
A judge will decide if there is enough evidence for the two to stand trial.
LA district attorney spokeswoman Jane Robison said that Alpha Lorenzo Walker contacted Stevie Wonder’s representatives and claimed to have embarrassing information about the musician.
Detectives organized a sting operation and the pair were arrested, she said.
Officials said Alpha Lorenzo Walker had identified himself as a relative of Stevie Wonder.
Police have not released any additional details about the investigation.
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