How do debt collectors find out who your relatives are?

There are collection agencies contacting a relative of mine trying to reach me. I just wanted to know how they manage to find out who my relatives are? I have a very common last name, so could they possibly be calling everyone in my state with the same last name? Or do they actually have some type of proof that so and so is my relative? Thanks in advance!
I forgot to mention that my relatives have no relation to my debt. They were never co-signers or ever listed with any of my finances.

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