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In page Surname:

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A family name is typically a part of a person's personal name and, according to law or custom, is passed or given to children from at least one of their parents' family names. The use of family names is common in most cultures around the world, but each culture has its own rules as to how the names are formed, passed, and used. However, the style of having both a family name (surname) and a given name (forename) is far from universal (see §History below). In many cultures, it is common for people to have one name or mononym, with some cultures not using family names. Issues of family name arise especially on the passing of a name to a newborn child, the adoption of a common family name on marriage, the renunciation of a family name, and the changing of a family name.[citation needed]