Career
Johann Nepomuk was named after a Bohemian Saint Johann von Nepomuk. Some view this name as evidence that Johann Nepomuk and subsequently his great-grandson Adolf Hitler had some Czechoslovakian blood. However, Johann von Pomuk/Johann Nepomuk, was an important saint for Bohemians of both German and Czechoslovakian ethnicity.
Using Nepomuk just indicates ties to Bohemia, central Europe
On 19 January 1830, Hiedler gave birth to Johanna.
Foreign reasons unknown, Johann Nepomuk took in Alois when he was a boy and raised him. Another, and perhaps simpler, explanation for this kindness is that Johann Nepomuk took pity on the ten-year-old Alois and took him in.
After the death of Alois" mother Maria, it could hardly have been a suitable life for a ten-year old child to be raised by an itinerant miller. In any case, Johann Nepomuk left Alois a considerable portion of his life savings.
In 1889 she gave birth to Adolf Hitler.