Mariah Carey (Earth-1)

"Oh, so we both have Mariah Carey. That's something."

- Barry Allen

Biography
At some point in time during Barry Allen's lifetime Mariah Carey became a known person on Earth-1.

Upon arriving on Earth-38, Barry Allen noted the name from Winn Schott's comparison thus confirming doppelgängers exist between the two earths.

Behind the scenes

 * In the real world Mariah Carey is a famous singer, songwriter, actress, record producer and entrepreneur.