When any country will become Republic? like India is called as Republic of India? Thanks.

 The changing of a country regime from a kingdom to a republic or vice versa is a decision which is taken by the peoples immediately like France and Canada or by the parliament like Turkey.

Sometimes, especially in the dictatorships, the president of the country takes the decision to give the country the republican name and give himself the name of the president of the republic using the military force of the country for this issue.

many thanks for the invitation and good question