Everyday, you see people (unless you are a hermit). Every person who we pass by each day are numbered by the dozens to the hundreds and then the thousands. You forget that there are millions throughout the countries and the Earth’s population of over 8 billions on this Earth.
Now let ask me you, do we know them all?
No, we don’t. It is impossible to know everyone who were born, live or dead. We have limits to explore to soul search.