Rep. Ilhan Omar told Fox News Digital that her "real name" is "Ilhan Abdullahi Omar" after a federal court filing identified the congresswoman by a last name matching that of her ex-husband, whom reports have alleged is her brother.

"Ilhan Abdullahi Omar, you know it," Omar told Fox News Digital when asked about her name. "It’s Ilhan Abdullahi Omar."

Omar was spotted by Fox News Digital at the Karmel Mall of Somalia in Minnesota as she made her way into the Karmel Masjid, inside the mall, for Friday prayers.

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Her comments come after two people familiar with the ongoing investigation into the Somali-born congresswoman, including a law enforcement source, said that her real name is Ilhan Nur Said Elmi. The last name is the same as her ex-husband, Ahmed Nur Said Elmi, who is alleged to be her brother.

Federal prosecutors referred to the Minnesota Democrat as "Ilhan Nur Said Elmi, a/k/a Ilhan Abdullahi Omar," in a Wednesday filing in D.C. federal court, as first reported by Fox News Digital. One source said the language used for her name in the filing reflected the evidence that has so far been compiled in the immigration fraud investigation.

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One source disputed Omar’s account of her name, telling Fox News Digital, ‘That’s not her real name.’

U.S. Attorney for the District of Columbia Jeanine Pirro filed a motion on Wednesday seeking to prevent the federal search warrant for the congresswoman’s home from being unsealed, which was requested by several media outlets. The motion says the federal government is not yet finished executing the search warrant, and that it shouldn’t be unsealed yet.

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"Before the Court are three Applications to unseal ex parte materials and proceedings related to a federal search warrant for the personal residence in the District of Columbia of Congresswoman Ilhan Nur Said Elmi, a/k/a Ilhan Abdullahi Omar…" the motion begins.

If proven in court that the congresswoman was not using her "real name," every single form she ever filled out could be subject to investigation, a former Minnesota federal immigration judge said.

Omar’s spokesperson repeatedly denied the claim, telling Fox News Digital on Thursday that the reports of her name being "Ilhan Nur Said Elmi" are "completely false," then proceeding with an attack on Fox News. The spokesperson also denied that Omar was once married to her brother, calling the claims a "disgusting conspiracy theory."

Omar’s residence in Washington, D.C., was raided by Homeland Security Investigations earlier this month as part of a probe into whether she or her father committed immigration fraud when becoming naturalized citizens. Federal authorities have since issued subpoenas to members of Omar’s family and seized her cellphone.

Fox News Digital’s Peter D’Abrosca and Kiera McDonald contributed to this report.