Parse this person name:

Walter Bohnbach, Gundolf Z. Michael Rotraud, born 1786
user
first_name: Gundolf
last_name: Walter Bohnbach
middle_names:
- Z.
- Michael
- Rotraud
temporal:
- start: 1786
  end: null
  type: life_span
titles: []
extra_info: []
assistant