What Does Your Last Name Mean
There are popular cultural designations that have been kept by most cultures that have advanced to the state of civilization that passes the tribal cultures known in Africa and in Australia. One of these popular cultural designations is the use of a last name to indicate family heritage. Your last name is your father's last name. That means that he has sired you or that he has given you his last name. That can be done either by biologically siring you or by adopting you. Your last name indicates who your father is. That is very important in civilized cultures.
The importance has to do with inheritance and also with keeping you from marrying a blood relative. That need arose when blood relatives were permitted to marry and gave birth to biologically deformed offspring. The genetic pool in blood relatives is, of course, similar. Any deformed gene that can produce a child with a biological deformity has twice the probability of occurring if you have a child with a blood relative.
In most civilized countries in Europe, a second or third cousin is permitted to marry another second or third cousin. A brother, sister or a first cousin is not permitted to marry a brother, sister or a first cousin. The restrictions are meant to protect the unborn child. Who would want to risk giving birth to a child who will be biologically deformed for his entire life. These restrictions were made political and then religious with the severe penalties of incest labelled on those who violated those restrictions. These restrictions are made easier to follow by using your real last name when introducing yourself. Your last name is not something you should withhold when meeting someone new who might think of you as a possible marriage partner.
Your last name is very important. There are still some tribal countries that might appear civilized like the island of Cyprus, whose people do not have last names. That claim is sometimes made by them but they do have family names. Their breeding habits has become a source of research by the Turks who have similar habits in giving their last names to their favorite child. These cultures have developed a different method of passing on their families last name than have European cultures.