India

↬┆Past Nickname: Adi(taken from his real name Aditya)

↬┆Nickname from Colonial times: Raj(taken from British Raj)

↬┆Nickname since independence: Ind(or informally Ity which only Bangla calls him)

Bangladesh

↬┆Past Nickname: Ani(taken from her real name Anadi)

↬┆Nickname from Colonial times: Bengal(taken from Princely state of Bengal)

↬┆Nickname from 1947-1971: E.B(short form of East Bengal) later changed to E.P(short form of East Pakistan)

↬┆Nicknane since independence: Bangla(or Ana, most call her that but sometimes Ind calls her Ani)

Pakistan

↬┆Past Nickname: Dilli(taken from his real name Adil)

↬┆Nickname from Colonial times: M.L(taken as short name of Muslim League)

↬┆Nickname since independence: Pak(or informally Didi, mostly Ind and Bangla call him that to tease him)