Parse this person name:

Zahn Dussen van, Sigrid Wera Blanka, born 1247
user
first_name: Sigrid
last_name: Zahn Dussen van
middle_names:
- Wera
- Blanka
temporal:
- start: 1247
  end: null
  type: life_span
titles: []
extra_info: []
assistant