Parse this person name:

Briere de Beer, Lena Emma Maud Rens Elias O. Emma Maud Rens Elias O.
user
first_name: Lena
last_name: Briere de Beer
middle_names:
- Emma
- Maud
- Rens
- Elias
- O.
temporal: []
titles: []
extra_info: []
assistant