Claim: Anni-Frid Lyngstad is only known as John Lyngstad.
Evidence: Anni-Frid Synni , Princess Reuss of Plauen -LRB- Anni-Frid Synni , Prinzessin Reuss von Plauen born Anni-Frid Synni Lyngstad , -LSB- ² ɑnːɪˌfriːd ˈlʏŋstɑ -RSB- ; -LSB- ² anːɪˌfriːd ˈlʏŋstɑːd -RSB- , 15 November 1945 -RRB- , widely known as Frida Lyngstad or by just the mononym Frida -LRB- -LSB- ² friːdɑ -RSB- ; -LSB- ² friːda -RSB- -RRB- , is a Swedish pop and jazz singer.