Oppolzer is a surname of Austrian origin. Most people with the surname Oppolzer have their ancestors in a small region in Southern Bohemia, which was Austrian in former times, but belongs to the Czech Republic today. There is also a small village with an old fort called Oppolz (Czech name Tycha) in this region.
Famous Oppolzers are
Both Johann and Theodor lived and worked in Vienna most of the time of their lives.
There is a lunar crater called Oppolzer, and an asteroid. Both are named after Theodor.
References
Oppolzer Wikipedia(Text) CC BY-SA