Caro is a surname, which means it is a family name that some people have. Just like how you have a family name, like Smith or Johnson, some people have the last name Caro.
When people have the same last name, it usually means that they are related in some way. It could be that they are part of the same family, and their parents and grandparents had the last name Caro too.
Last names can come from different places. Sometimes they come from the name of a job that someone's family used to have a long time ago. For example, if their ancestor was a blacksmith, their family name might have become Smith. But the name Caro doesn't really have a specific meaning like that, it is just a name that some people have.
Sometimes people with the last name Caro might have ancestors who came from a certain part of the world where that name is more common. Names can change and move around as people travel and move to new places. So, you might find people with the last name Caro in different parts of the world, but it might be more common in some places than others.
It's also possible that people with the last name Caro might not be related at all. Sometimes people with different families can have the same last name because their ancestors just happened to come up with the same name, even though they are not directly related.
So, in summary, Caro is a last name that some people have. It can come from different places and might mean different things, but ultimately it's just a name that some families have and share.