As a prologue, I have explain that I inherited rather distinctive last name. Chances are, that if we share my last name, we're related.
In the 90s, I worked my way through college working in a gas station. Routinely, people would pas for gasoline with a credit card, so I would learn the names of random people.
One day, a gentleman handed me his credit card. In processing his purchase, I noted we shared a last name. When I told him this, he didn't believe me. I had to show him my driver's license to prove it.