Learn what "having a same last name is a coincidence" means, when people say it, and how to use it naturally in English.

This means the speaker is saying that a shared surname is not meaningful evidence of a relationship or identity link.
From Lost And Found, Episode 3
Someone explains that sharing a last name does not prove any deeper connection.
Use this when clarifying a family connection or correcting an assumption. It sounds neutral and factual, so it works best in explanation rather than argument.
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