inner portion of the kidney where the nephron tubes come together in the collecting tubules renal basin or pelvis area where the upper ureter expands to form a basin that receives urine from the collecting tubules
The average educated native English speaker knows around 35,000 words, which is roughly 20% of 171,476 words in current usage. If you're the ambitious type and likes to apply Pareto's 80/20 Rule, then 20% of 35,000 words is only 7,000 words -- then you're in business for 95% coverage and be 'educated' to boot!
That's a lot of people. The U.S. Census Bureau statistics tell us that there are at least 151,671 different last names and 5,163 different first names in common use in the United States. Some names are more common than others.