[9nGQluzmnq3M]

You don't have to look all that far back, Japan had a codified and brutally enforced (instant death penalty) case system until the late 1800s:

https://en.wikipedia.org/wiki/Edo_society

Virtually nothing of it remains today though, although there are some traces of discrimination against the burakumin (Japan's untouchables) and some (rare) names are associated with the nobility. Generally speaking, though, you can't tell somebody's former caste from the name: a Maeda could be a direct descendent of the samurai clan, a retainer or peasant in the Maeda lands who adopted the name, or some random person anywhere in Japan who happened to live near the front (mae) rice paddy (-da) since Japanese names tend to reflect places, not occupations. Those few who care about "pure blood" have to hire a private investigator to ferret out burakumin traces.