| Willi | English astronomer (born in Germany) who discovered infrared light and who catalogued the stars and discovered the planet Uranus (1738-1822) |
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| Willi | English artist noted for a series of engravings that satirized the affectations of his time (1697-1764) |
| Willi | English Pre-Raphaelite painter (1827-1910) |
| Willi | United State educator who compiled the McGuffey Eclectic Readers (1800-1873) |
| Willi | United States industrialist who manufactured vacuum cleaners (1849-1932) |
| Willi | 27th President of the United States and later chief justice of the United States Supreme Court (1857-1930) |
| Willi | American jurist who served as an associate justice on the United States Supreme Court from 1972 until 1986, when he was appointed chief justice (born in 1924) |
| Willi | English chemist and physicist who discovered palladium and rhodium and demonstrated that static and current electricity are the same (1766-1828) |
| Willi | duke of Normandy who led the Norman invasion of England and became King of England |
| Willi | the second son of William the Conqueror who succeeded him as King of England (1056-1100) |
| Willi | King of England and Scotland and Ireland |
| Willi | United States playwright (1913-1973) |