Norway's capital was called christiania before its name was change in 1924what is it called now?

It is now called Oslo.

Its called Oslo now. It was called Christiana before

Oslo (Norwegian pronunciation: [ùʃlu] or [ùslu]) is a county and municipality, as well as the capital and largest city in Norway. Oslo was established as a municipality on 1 January 1838. Founded...

it is called modern age

It is an honorific to denote married status.