Parse this person name:

Gotthard A. A. Oswin Siegmar R. Bolnbach von Preußen, ca. 1718-1752
user
first_name: Gotthard
last_name: Bolnbach
middle_names:
- A.
- A.
- Oswin
- Siegmar
- R.
temporal:
- start: 1718
  end: 1752
  type: life_span
titles: []
extra_info: []
assistant