Parse this person name:

Valentin Neveu, Christophe François D. Grégoire, died 1554
user
first_name: Christophe
last_name: Valentin Neveu
middle_names:
- François
- D.
- Grégoire
temporal:
- start: null
  end: 1554
  type: life_span
titles: []
extra_info: []
assistant