Your family name is not Glownia as such last name doesn't exist in Polish. It is most likely Głownia
Here is the map showing where in Poland people with the last name Głownia live: moikrewni.pl/mapa/kompletny/g%25C5%2582ownia.html
If you have your grandfather's a passport then you have the information.
Also, I am quite sure that your grandfather's first name in his passport isn't Ludwig but Ludwik. If you are searching for the info you should be more careful with details.
Your family may come from southern Poland or from the city of Olsztyn.
Zazulka says that your grandfathers name is rather Ludwik, but in fact both of you can be right. Ludwik is the polish version and Ludwig is a german version of the same name. In the beginning of the 20th century in both regions german was the official language, so actually it is possible.
If you would like me to help you find your roots, please contact me at email@example.com. I run a small genealogy research bureau for genealogy researches in regions of current and former Poland. I also have some information about Ludwig Glowna born ca. 1875 but you gave to little information to ensure me that it is your grandfather.
Barbara from Poland