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During an interview on ABC Sunday, White House chief of staff Denis McDonough apparently dropped the first name of the last American hostage held by ISIS—a woman whose name was kept secret for almost a year-and-a-half.

It came out when George Stephanopoulos asked McDonough if there was "any information" on the 26-year-old woman, who was kidnapped along with several members of her humanitarian aid group in August, 2013.

In his answer, McDonough referenced "Kayla's family." Her name had previously been kept private, her family says, "for her own safety."

McDonough's gaffe was reportedly first noted by ABC's Jon Williams and later picked up by The Politico, which redacted the name from the report at the request of the White House.

Contact the author at gabrielle@gawker.com