Why do most societies have two-name system?

Family is a big part of almost every culture, because of our instinct to have kids and support them and ensure that our genes get passed down. We have a natural desire to make sure our kids do well, so they can have kids and pass down their genes, thus ensuring the survival of the species.

If you have a bunch of families living together, you need family names to distinguish different families from each other, and you need first names to distinguish different individuals within that family.

Systems with two, three, and four names are all common. One name is also not too rare (notably in Indonesia). Most USA citizens have three names. Many Mexican and Spanish citizens have four names.

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