Parse this person name:

Rädel Geisler, Ottomar G. Rolf-Peter Gerolf Alexej Sigismund G. Rolf-Peter Gerolf Alexej Sigismund
user
first_name: Ottomar
last_name: Rädel Geisler
middle_names:
- G.
- Rolf-Peter
- Gerolf
- Alexej
- Sigismund
temporal: []
titles: []
extra_info: []
assistant