Why wife shall take her husband's surname? Why a surname?

To use surname, to change the surname of woman after she marries to her husband ( the husband does not change his surname to his wife's surname), to use the surname of father only for the children is mostly an English norm. Before Britishers came to India, this was not the practice. In the era of equality between sexes, gender deconstruct, overcoming generation gap, same sex marriages, it is unbecoming to change one's surname or even use one. The surname or the family name is mostly a male lineage. In India in majority cases, a caste is known by surname or family name. Common 'surname' name for more than one caste often invokes curiosity when a person is introduced to another one. If we get rid of 'surname' use the first or the given name, some discrimination will be reduced.