In most cases, you probably want formerly known as, referring to an old name that is no longer used. For example, "Benin, formerly known as Dahomey, is a country in West Africa."
In the alternative, formally known as refers to a fancy name that is usually abbreviated in ordinary use. For example, "The UK, formally known as the United Kingdom of Great Britain and Northern Ireland, is a country in Europe."
Formally means properly or officially (adv.)Formerly means earlier (adv.)example:Formerly they knew the family very well.They formally dressed for the wedding.
Formally, it's known as New York, New York. The main part most people think of as NYC is formally known as Manhattan. Of course, formerly it was known New Amsterdam. (The tense of your question suggests you meant formerly and not formally. Learn to spell.)
Being short in stature (less than 4 feet 11 inches) is known as dwarfism. People who have this condition were formerly called midgets.
The land that was once called British Honduras is now the country of Belize.
Oslo was formerly known as Christina
Taiwan was formerly known as Formosa.
The Apache Tomcat was formally known as Jakarta Tomcat.
russia was formally known as the soviet union
Guyana was known as British Guiana until its independence on 26 May 1966
Yes, the Sami, formerly known as the Lapps.
The city of Vadodara in Gujarat was formerly known as Baroda.
It was formally known as Dominion Day but then after the Canada Act in 1982 it was called Canada Day.