Question

If it is not mentioned in the question of the formal letter that what is his or hsr name should we right our name or xyz . i wrote my name will my marks be cut .

Answer 1

if it was given to write the informal letter explaining your situation or whatsoever regarding you, you could have mentioned your name there, but if it was regarding someone else, then, you had to write XYZ

Answer 2

We have to write XYZ.